refactor: code quality improvements and fix arcvMinimum constant

Fix critical bug: arcvMinimum polynomial constant was 7.1651 (wrong) instead of 11.8371 (Odeh 2006) in getMoonVisibilityEstimate. Now imports the canonical arcvMinimum() from visibility module. Deduplicate shared code across modules: - arcvMinimum polynomial: single source in visibility/index.ts - dot/norm vector helpers: use vdot/vnorm from math/index.ts - DEG constant: use DEG2RAD from math/index.ts - jdToJSDate: use jdToDate from time/index.ts Add input validation to all public API functions (lat/lon range, valid Date instances). Add ESLint + Prettier with TypeScript support. Convert tests to node:test runner. Fix package.json exports to use nested types-first format. Pin devDependencies to caret ranges. Add noImplicitReturns and noFallthroughCasesInSwitch to tsconfig. Replace .markdownlint.json with .vscode/settings.json. Update CI workflow with lint job. Expand .gitignore coverage.
2026-06-30 19:04:24 +00:00 · 2026-03-08 11:39:28 -04:00 · 2026-03-08 11:39:28 -04:00 · 8bf34fb696
commit 8bf34fb696
parent 3b666c6465
21 changed files with 1887 additions and 1031 deletions
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@ -22,10 +22,26 @@ jobs:
        with:
          node-version: ${{ matrix.node }}
          cache: pnpm
-      - run: pnpm install
+      - run: pnpm install --frozen-lockfile
      - run: pnpm build
-      - run: node test.mjs
-      - run: node test-cjs.cjs
+      - run: node --test test.mjs
+      - run: node --test test-cjs.cjs
+
+  lint:
+    name: Lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: pnpm/action-setup@v4
+        with:
+          version: 10
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 24
+          cache: pnpm
+      - run: pnpm install --frozen-lockfile
+      - run: pnpm run lint
+      - run: pnpm run format:check

  typecheck:
    name: TypeScript
@ -39,7 +55,7 @@ jobs:
        with:
          node-version: 24
          cache: pnpm
-      - run: pnpm install
+      - run: pnpm install --frozen-lockfile
      - run: pnpm run typecheck

  pack-check:
@ -54,17 +70,16 @@ jobs:
        with:
          node-version: 24
          cache: pnpm
-      - run: pnpm install
+      - run: pnpm install --frozen-lockfile
      - run: pnpm build
      - name: Verify pack contents
        run: |
          npm pack --dry-run 2>&1 | tee pack-output.txt
-          # Verify expected files are present
          grep -q "dist/index.cjs" pack-output.txt || (echo "Missing dist/index.cjs" && exit 1)
          grep -q "dist/index.mjs" pack-output.txt || (echo "Missing dist/index.mjs" && exit 1)
          grep -q "dist/index.d.ts" pack-output.txt || (echo "Missing dist/index.d.ts" && exit 1)
+          grep -q "dist/index.d.mts" pack-output.txt || (echo "Missing dist/index.d.mts" && exit 1)
          grep -q "README.md" pack-output.txt || (echo "Missing README.md" && exit 1)
-          # Verify no test files or .gitignore items are included
          ! grep -q "test.mjs" pack-output.txt || (echo "test.mjs should not be in pack" && exit 1)
          ! grep -q "node_modules" pack-output.txt || (echo "node_modules should not be in pack" && exit 1)
          echo "Pack contents verified."
--- a/.gitignore
+++ b/.gitignore
@ -1,7 +1,10 @@
 node_modules/
 dist/
+build/
+out/
 *.tgz
 *.log
+*.tsbuildinfo
 .DS_Store
 .env
 .env.*
@ -11,8 +14,28 @@ dist/
 *.bsp
 *.tls

+# PnP
+.pnp
+.pnp.js
+
+# Coverage
+coverage/
+
+# IDE
+.vscode/
+.idea/
+*.swp
+
 # AI agent directories
 .claude/
 .cursor/
-.aider/
+.copilot/
+.aider*
 .continue/
+.codex/
+.gemini/
+.vscode/*
+.aider/
+.aider.chat.history.md
+.windsurf/
+.codeium/
--- a/.markdownlint.json
+++ b/.markdownlint.json
@ -1,4 +0,0 @@
-{
-  "MD013": false,
-  "MD024": { "siblings_only": true }
-}
--- a/.prettierrc
+++ b/.prettierrc
@ -0,0 +1,7 @@
+{
+  "semi": false,
+  "singleQuote": true,
+  "trailingComma": "all",
+  "printWidth": 100,
+  "tabWidth": 2
+}
--- a/eslint.config.mjs
+++ b/eslint.config.mjs
@ -0,0 +1,12 @@
+import eslint from '@eslint/js'
+import tseslint from 'typescript-eslint'
+import prettier from 'eslint-config-prettier'
+
+export default tseslint.config(
+  eslint.configs.recommended,
+  ...tseslint.configs.recommended,
+  prettier,
+  {
+    ignores: ['dist/', 'node_modules/', 'test.mjs', 'test-cjs.cjs'],
+  },
+)
--- a/package.json
+++ b/package.json
@ -9,9 +9,14 @@
  "types": "./dist/index.d.ts",
  "exports": {
    ".": {
-      "types": "./dist/index.d.ts",
-      "import": "./dist/index.mjs",
-      "require": "./dist/index.cjs"
+      "import": {
+        "types": "./dist/index.d.mts",
+        "default": "./dist/index.mjs"
+      },
+      "require": {
+        "types": "./dist/index.d.ts",
+        "default": "./dist/index.cjs"
+      }
    }
  },
  "bin": {
@ -31,14 +36,22 @@
    "build": "tsup",
    "typecheck": "tsc --noEmit",
    "pretest": "tsup",
-    "test": "node test.mjs && node test-cjs.cjs",
+    "test": "node --test test.mjs test-cjs.cjs",
+    "lint": "eslint src/",
+    "format": "prettier --write src/",
+    "format:check": "prettier --check src/",
    "prepublishOnly": "tsup",
    "cli": "node dist/cli/index.cjs"
  },
  "devDependencies": {
-    "@types/node": "latest",
-    "tsup": "latest",
-    "typescript": "latest"
+    "@eslint/js": "^10.0.1",
+    "@types/node": "^25.3.0",
+    "eslint": "^10.0.3",
+    "eslint-config-prettier": "^10.1.8",
+    "prettier": "^3.8.1",
+    "tsup": "^8.5.1",
+    "typescript": "^5.9.3",
+    "typescript-eslint": "^8.56.1"
  },
  "publishConfig": {
    "access": "public",
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@ -8,15 +8,30 @@ importers:

  .:
    devDependencies:
+      '@eslint/js':
+        specifier: ^10.0.1
+        version: 10.0.1(eslint@10.0.3)
      '@types/node':
-        specifier: latest
+        specifier: ^25.3.0
        version: 25.3.0
+      eslint:
+        specifier: ^10.0.3
+        version: 10.0.3
+      eslint-config-prettier:
+        specifier: ^10.1.8
+        version: 10.1.8(eslint@10.0.3)
+      prettier:
+        specifier: ^3.8.1
+        version: 3.8.1
      tsup:
-        specifier: latest
+        specifier: ^8.5.1
        version: 8.5.1(typescript@5.9.3)
      typescript:
-        specifier: latest
+        specifier: ^5.9.3
        version: 5.9.3
+      typescript-eslint:
+        specifier: ^8.56.1
+        version: 8.56.1(eslint@10.0.3)(typescript@5.9.3)

 packages:

@ -176,6 +191,61 @@ packages:
    cpu: [x64]
    os: [win32]

+  '@eslint-community/eslint-utils@4.9.1':
+    resolution: {integrity: sha512-phrYmNiYppR7znFEdqgfWHXR6NCkZEK7hwWDHZUjit/2/U0r6XvkDl0SYnoM51Hq7FhCGdLDT6zxCCOY1hexsQ==}
+    engines: {node: ^12.22.0 || ^14.17.0 || >=16.0.0}
+    peerDependencies:
+      eslint: ^6.0.0 || ^7.0.0 || >=8.0.0
+
+  '@eslint-community/regexpp@4.12.2':
+    resolution: {integrity: sha512-EriSTlt5OC9/7SXkRSCAhfSxxoSUgBm33OH+IkwbdpgoqsSsUg7y3uh+IICI/Qg4BBWr3U2i39RpmycbxMq4ew==}
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+
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+    engines: {node: ^20.19.0 || ^22.13.0 || >=24}
+
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+    peerDependencies:
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+    peerDependenciesMeta:
+      eslint:
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+    engines: {node: '>=12.22'}
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+    engines: {node: '>=18.18'}
+
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@ -327,20 +397,101 @@ packages:
    cpu: [x64]
    os: [win32]

+  '@types/esrecurse@4.3.1':
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+
  '@types/estree@1.0.8':
    resolution: {integrity: sha512-dWHzHa2WqEXI/O1E9OjrocMTKJl2mSrEolh1Iomrv6U+JuNwaHXsXx9bLu5gG7BUWFIN0skIQJQ/L1rIex4X6w==}

+  '@types/json-schema@7.0.15':
+    resolution: {integrity: sha512-5+fP8P8MFNC+AyZCDxrB2pkZFPGzqQWUzpSeuuVLvm8VMcorNYavBqoFcxK8bQz4Qsbn4oUEEem4wDLfcysGHA==}
+
  '@types/node@25.3.0':
    resolution: {integrity: sha512-4K3bqJpXpqfg2XKGK9bpDTc6xO/xoUP/RBWS7AtRMug6zZFaRekiLzjVtAoZMquxoAbzBvy5nxQ7veS5eYzf8A==}

+  '@typescript-eslint/eslint-plugin@8.56.1':
+    resolution: {integrity: sha512-Jz9ZztpB37dNC+HU2HI28Bs9QXpzCz+y/twHOwhyrIRdbuVDxSytJNDl6z/aAKlaRIwC7y8wJdkBv7FxYGgi0A==}
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+      eslint: ^8.57.0 || ^9.0.0 || ^10.0.0
+      typescript: '>=4.8.4 <6.0.0'
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+    engines: {node: ^18.18.0 || ^20.9.0 || >=21.1.0}
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+
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+    engines: {node: 18 || 20 || >=22}
+
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+
  bundle-require@5.1.0:
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@ -366,6 +517,10 @@ packages:
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    engines: {node: ^14.18.0 || >=16.10.0}

+  cross-spawn@7.0.6:
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+
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    engines: {node: '>=6.0'}
@ -375,11 +530,75 @@ packages:
      supports-color:
        optional: true

+  deep-is@0.1.4:
+    resolution: {integrity: sha512-oIPzksmTg4/MriiaYGO+okXDT7ztn/w3Eptv/+gSIdMdKsJo0u4CfYNFJPy+4SKMuCqGw2wxnA+URMg3t8a/bQ==}
+
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    hasBin: true

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+    engines: {node: ^20.19.0 || ^22.13.0 || >=24}
+
+  eslint-visitor-keys@3.4.3:
+    resolution: {integrity: sha512-wpc+LXeiyiisxPlEkUzU6svyS1frIO3Mgxj1fdy7Pm8Ygzguax2N3Fa/D/ag1WqbOprdI+uY6wMUl8/a2G+iag==}
+    engines: {node: ^12.22.0 || ^14.17.0 || >=16.0.0}
+
+  eslint-visitor-keys@5.0.1:
+    resolution: {integrity: sha512-tD40eHxA35h0PEIZNeIjkHoDR4YjjJp34biM0mDvplBe//mB+IHCqHDGV7pxF+7MklTvighcCPPZC7ynWyjdTA==}
+    engines: {node: ^20.19.0 || ^22.13.0 || >=24}
+
+  eslint@10.0.3:
+    resolution: {integrity: sha512-COV33RzXZkqhG9P2rZCFl9ZmJ7WL+gQSCRzE7RhkbclbQPtLAWReL7ysA0Sh4c8Im2U9ynybdR56PV0XcKvqaQ==}
+    engines: {node: ^20.19.0 || ^22.13.0 || >=24}
+    hasBin: true
+    peerDependencies:
+      jiti: '*'
+    peerDependenciesMeta:
+      jiti:
+        optional: true
+
+  espree@11.2.0:
+    resolution: {integrity: sha512-7p3DrVEIopW1B1avAGLuCSh1jubc01H2JHc8B4qqGblmg5gI9yumBgACjWo4JlIc04ufug4xJ3SQI8HkS/Rgzw==}
+    engines: {node: ^20.19.0 || ^22.13.0 || >=24}
+
+  esquery@1.7.0:
+    resolution: {integrity: sha512-Ap6G0WQwcU/LHsvLwON1fAQX9Zp0A2Y6Y/cJBl9r/JbW90Zyg4/zbG6zzKa2OTALELarYHmKu0GhpM5EO+7T0g==}
+    engines: {node: '>=0.10'}
+
+  esrecurse@4.3.0:
+    resolution: {integrity: sha512-KmfKL3b6G+RXvP8N1vr3Tq1kL/oCFgn2NYXEtqP8/L3pKapUA4G8cFVaoF3SU323CD4XypR/ffioHmkti6/Tag==}
+    engines: {node: '>=4.0'}
+
+  estraverse@5.3.0:
+    resolution: {integrity: sha512-MMdARuVEQziNTeJD8DgMqmhwR11BRQ/cBP+pLtYdSTnf3MIO8fFeiINEbX36ZdNlfU/7A9f3gUw49B3oQsvwBA==}
+    engines: {node: '>=4.0'}
+
+  esutils@2.0.3:
+    resolution: {integrity: sha512-kVscqXk4OCp68SZ0dkgEKVi6/8ij300KBWTJq32P/dYeWTSwK41WyTxalN1eRmA5Z9UU/LX9D7FWSmV9SAYx6g==}
+    engines: {node: '>=0.10.0'}
+
+  fast-deep-equal@3.1.3:
+    resolution: {integrity: sha512-f3qQ9oQy9j2AhBe/H9VC91wLmKBCCU/gDOnKNAYG5hswO7BLKj09Hc5HYNz9cGI++xlpDCIgDaitVs03ATR84Q==}
+
+  fast-json-stable-stringify@2.1.0:
+    resolution: {integrity: sha512-lhd/wF+Lk98HZoTCtlVraHtfh5XYijIjalXck7saUtuanSDyLMxnHhSXEDJqHxD7msR8D0uCmqlkwjCV8xvwHw==}
+
+  fast-levenshtein@2.0.6:
+    resolution: {integrity: sha512-DCXu6Ifhqcks7TZKY3Hxp3y6qphY5SJZmrWMDrKcERSOXWQdMhU9Ig/PYrzyw/ul9jOIyh0N4M0tbC5hodg8dw==}
+
  fdir@6.5.0:
    resolution: {integrity: sha512-tIbYtZbucOs0BRGqPJkshJUYdL+SDH7dVM8gjy+ERp3WAUjLEFJE+02kanyHtwjWOnwrKYBiwAmM0p4kLJAnXg==}
    engines: {node: '>=12.0.0'}
@ -389,18 +608,76 @@ packages:
      picomatch:
        optional: true

+  file-entry-cache@8.0.0:
+    resolution: {integrity: sha512-XXTUwCvisa5oacNGRP9SfNtYBNAMi+RPwBFmblZEF7N7swHYQS6/Zfk7SRwx4D5j3CH211YNRco1DEMNVfZCnQ==}
+    engines: {node: '>=16.0.0'}
+
+  find-up@5.0.0:
+    resolution: {integrity: sha512-78/PXT1wlLLDgTzDs7sjq9hzz0vXD+zn+7wypEe4fXQxCmdmqfGsEPQxmiCSQI3ajFV91bVSsvNtrJRiW6nGng==}
+    engines: {node: '>=10'}
+
  fix-dts-default-cjs-exports@1.0.1:
    resolution: {integrity: sha512-pVIECanWFC61Hzl2+oOCtoJ3F17kglZC/6N94eRWycFgBH35hHx0Li604ZIzhseh97mf2p0cv7vVrOZGoqhlEg==}

+  flat-cache@4.0.1:
+    resolution: {integrity: sha512-f7ccFPK3SXFHpx15UIGyRJ/FJQctuKZ0zVuN3frBo4HnK3cay9VEW0R6yPYFHC0AgqhukPzKjq22t5DmAyqGyw==}
+    engines: {node: '>=16'}
+
+  flatted@3.3.4:
+    resolution: {integrity: sha512-3+mMldrTAPdta5kjX2G2J7iX4zxtnwpdA8Tr2ZSjkyPSanvbZAcy6flmtnXbEybHrDcU9641lxrMfFuUxVz9vA==}
+
  fsevents@2.3.3:
    resolution: {integrity: sha512-5xoDfX+fL7faATnagmWPpbFtwh/R77WmMMqqHGS65C3vvB0YHrgF+B1YmZ3441tMj5n63k0212XNoJwzlhffQw==}
    engines: {node: ^8.16.0 || ^10.6.0 || >=11.0.0}
    os: [darwin]

+  glob-parent@6.0.2:
+    resolution: {integrity: sha512-XxwI8EOhVQgWp6iDL+3b0r86f4d6AX6zSU55HfB4ydCEuXLXc5FcYeOu+nnGftS4TEju/11rt4KJPTMgbfmv4A==}
+    engines: {node: '>=10.13.0'}
+
+  ignore@5.3.2:
+    resolution: {integrity: sha512-hsBTNUqQTDwkWtcdYI2i06Y/nUBEsNEDJKjWdigLvegy8kDuJAS8uRlpkkcQpyEXL0Z/pjDy5HBmMjRCJ2gq+g==}
+    engines: {node: '>= 4'}
+
+  ignore@7.0.5:
+    resolution: {integrity: sha512-Hs59xBNfUIunMFgWAbGX5cq6893IbWg4KnrjbYwX3tx0ztorVgTDA6B2sxf8ejHJ4wz8BqGUMYlnzNBer5NvGg==}
+    engines: {node: '>= 4'}
+
+  imurmurhash@0.1.4:
+    resolution: {integrity: sha512-JmXMZ6wuvDmLiHEml9ykzqO6lwFbof0GG4IkcGaENdCRDDmMVnny7s5HsIgHCbaq0w2MyPhDqkhTUgS2LU2PHA==}
+    engines: {node: '>=0.8.19'}
+
+  is-extglob@2.1.1:
+    resolution: {integrity: sha512-SbKbANkN603Vi4jEZv49LeVJMn4yGwsbzZworEoyEiutsN3nJYdbO36zfhGJ6QEDpOZIFkDtnq5JRxmvl3jsoQ==}
+    engines: {node: '>=0.10.0'}
+
+  is-glob@4.0.3:
+    resolution: {integrity: sha512-xelSayHH36ZgE7ZWhli7pW34hNbNl8Ojv5KVmkJD4hBdD3th8Tfk9vYasLM+mXWOZhFkgZfxhLSnrwRr4elSSg==}
+    engines: {node: '>=0.10.0'}
+
+  isexe@2.0.0:
+    resolution: {integrity: sha512-RHxMLp9lnKHGHRng9QFhRCMbYAcVpn69smSGcq3f36xjgVVWThj4qqLbTLlq7Ssj8B+fIQ1EuCEGI2lKsyQeIw==}
+
  joycon@3.1.1:
    resolution: {integrity: sha512-34wB/Y7MW7bzjKRjUKTa46I2Z7eV62Rkhva+KkopW7Qvv/OSWBqvkSY7vusOPrNuZcUG3tApvdVgNB8POj3SPw==}
    engines: {node: '>=10'}

+  json-buffer@3.0.1:
+    resolution: {integrity: sha512-4bV5BfR2mqfQTJm+V5tPPdf+ZpuhiIvTuAB5g8kcrXOZpTT/QwwVRWBywX1ozr6lEuPdbHxwaJlm9G6mI2sfSQ==}
+
+  json-schema-traverse@0.4.1:
+    resolution: {integrity: sha512-xbbCH5dCYU5T8LcEhhuh7HJ88HXuW3qsI3Y0zOZFKfZEHcpWiHU/Jxzk629Brsab/mMiHQti9wMP+845RPe3Vg==}
+
+  json-stable-stringify-without-jsonify@1.0.1:
+    resolution: {integrity: sha512-Bdboy+l7tA3OGW6FjyFHWkP5LuByj1Tk33Ljyq0axyzdk9//JSi2u3fP1QSmd1KNwq6VOKYGlAu87CisVir6Pw==}
+
+  keyv@4.5.4:
+    resolution: {integrity: sha512-oxVHkHR/EJf2CNXnWxRLW6mg7JyCCUcG0DtEGmL2ctUo1PNTin1PUil+r/+4r5MpVgC/fn1kjsx7mjSujKqIpw==}
+
+  levn@0.4.1:
+    resolution: {integrity: sha512-+bT2uH4E5LGE7h/n3evcS/sQlJXCpIp6ym8OWJ5eV6+67Dsql/LaaT7qJBAt2rzfoa/5QBGBhxDix1dMt2kQKQ==}
+    engines: {node: '>= 0.8.0'}
+
  lilconfig@3.1.3:
    resolution: {integrity: sha512-/vlFKAoH5Cgt3Ie+JLhRbwOsCQePABiU3tJ1egGvyQ+33R/vcwM2Zl2QR/LzjsBeItPt3oSVXapn+m4nQDvpzw==}
    engines: {node: '>=14'}
@ -412,9 +689,17 @@ packages:
    resolution: {integrity: sha512-IXO6OCs9yg8tMKzfPZ1YmheJbZCiEsnBdcB03l0OcfK9prKnJb96siuHCr5Fl37/yo9DnKU+TLpxzTUspw9shg==}
    engines: {node: ^12.20.0 || ^14.13.1 || >=16.0.0}

+  locate-path@6.0.0:
+    resolution: {integrity: sha512-iPZK6eYjbxRu3uB4/WZ3EsEIMJFMqAoopl3R+zuq0UjcAm/MO6KCweDgPfP3elTztoKP3KtnVHxTn2NHBSDVUw==}
+    engines: {node: '>=10'}
+
  magic-string@0.30.21:
    resolution: {integrity: sha512-vd2F4YUyEXKGcLHoq+TEyCjxueSeHnFxyyjNp80yg0XV4vUhnDer/lvvlqM/arB5bXQN5K2/3oinyCRyx8T2CQ==}

+  minimatch@10.2.4:
+    resolution: {integrity: sha512-oRjTw/97aTBN0RHbYCdtF1MQfvusSIBQM0IZEgzl6426+8jSC0nF1a/GmnVLpfB9yyr6g6FTqWqiZVbxrtaCIg==}
+    engines: {node: 18 || 20 || >=22}
+
  mlly@1.8.0:
    resolution: {integrity: sha512-l8D9ODSRWLe2KHJSifWGwBqpTZXIXTeo8mlKjY+E2HAakaTeNpqAyBZ8GSqLzHgw4XmHmC8whvpjJNMbFZN7/g==}

@ -424,10 +709,33 @@ packages:
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    resolution: {integrity: sha512-z81GNO7nnYMEhrGh9LeymoE4+Yr0Wn5McHIZMK5cfQCl+NDX08sCZgUc9/6MHni9IWuFLm1Z3HTCXu2z9fN62Q==}

+  natural-compare@1.4.0:
+    resolution: {integrity: sha512-OWND8ei3VtNC9h7V60qff3SVobHr996CTwgxubgyQYEpg290h9J0buyECNNJexkFm5sOajh5G116RYA1c8ZMSw==}
+
  object-assign@4.1.1:
    resolution: {integrity: sha512-rJgTQnkUnH1sFw8yT6VSU3zD3sWmu6sZhIseY8VX+GRu3P6F7Fu+JNDoXfklElbLJSnc3FUQHVe4cU5hj+BcUg==}
    engines: {node: '>=0.10.0'}

+  optionator@0.9.4:
+    resolution: {integrity: sha512-6IpQ7mKUxRcZNLIObR0hz7lxsapSSIYNZJwXPGeF0mTVqGKFIXj1DQcMoT22S3ROcLyY/rz0PWaWZ9ayWmad9g==}
+    engines: {node: '>= 0.8.0'}
+
+  p-limit@3.1.0:
+    resolution: {integrity: sha512-TYOanM3wGwNGsZN2cVTYPArw454xnXj5qmWF1bEoAc4+cU/ol7GVh7odevjp1FNHduHc3KZMcFduxU5Xc6uJRQ==}
+    engines: {node: '>=10'}
+
+  p-locate@5.0.0:
+    resolution: {integrity: sha512-LaNjtRWUBY++zB5nE/NwcaoMylSPk+S+ZHNB1TzdbMJMny6dynpAGt7X/tl/QYq3TIeE6nxHppbo2LGymrG5Pw==}
+    engines: {node: '>=10'}
+
+  path-exists@4.0.0:
+    resolution: {integrity: sha512-ak9Qy5Q7jYb2Wwcey5Fpvg2KoAc/ZIhLSLOSBmRmygPsGwkVVt0fZa0qrtMz+m6tJTAHfZQ8FnmB4MG4LWy7/w==}
+    engines: {node: '>=8'}
+
+  path-key@3.1.1:
+    resolution: {integrity: sha512-ojmeN0qd+y0jszEtoY48r0Peq5dwMEkIlCOu6Q5f41lfkswXuKtYrhgoTpLnyIcHm24Uhqx+5Tqm2InSwLhE6Q==}
+    engines: {node: '>=8'}
+
  pathe@2.0.3:
    resolution: {integrity: sha512-WUjGcAqP1gQacoQe+OBJsFA7Ld4DyXuUIjZ5cc75cLHvJ7dtNsTugphxIADwspS+AraAUePCKrSVtPLFj/F88w==}

@ -463,6 +771,19 @@ packages:
      yaml:
        optional: true

+  prelude-ls@1.2.1:
+    resolution: {integrity: sha512-vkcDPrRZo1QZLbn5RLGPpg/WmIQ65qoWWhcGKf/b5eplkkarX0m9z8ppCat4mlOqUsWpyNuYgO3VRyrYHSzX5g==}
+    engines: {node: '>= 0.8.0'}
+
+  prettier@3.8.1:
+    resolution: {integrity: sha512-UOnG6LftzbdaHZcKoPFtOcCKztrQ57WkHDeRD9t/PTQtmT0NHSeWWepj6pS0z/N7+08BHFDQVUrfmfMRcZwbMg==}
+    engines: {node: '>=14'}
+    hasBin: true
+
+  punycode@2.3.1:
+    resolution: {integrity: sha512-vYt7UD1U9Wg6138shLtLOvdAu+8DsC/ilFtEVHcH+wydcSpNE20AfSOduf6MkRFahL5FY7X1oU7nKVZFtfq8Fg==}
+    engines: {node: '>=6'}
+
  readdirp@4.1.2:
    resolution: {integrity: sha512-GDhwkLfywWL2s6vEjyhri+eXmfH6j1L7JE27WhqLeYzoh/A3DBaYGEj2H/HFZCn/kMfim73FXxEJTw06WtxQwg==}
    engines: {node: '>= 14.18.0'}
@ -476,6 +797,19 @@ packages:
    engines: {node: '>=18.0.0', npm: '>=8.0.0'}
    hasBin: true

+  semver@7.7.4:
+    resolution: {integrity: sha512-vFKC2IEtQnVhpT78h1Yp8wzwrf8CM+MzKMHGJZfBtzhZNycRFnXsHk6E5TxIkkMsgNS7mdX3AGB7x2QM2di4lA==}
+    engines: {node: '>=10'}
+    hasBin: true
+
+  shebang-command@2.0.0:
+    resolution: {integrity: sha512-kHxr2zZpYtdmrN1qDjrrX/Z1rR1kG8Dx+gkpK1G4eXmvXswmcE1hTWBWYUzlraYw1/yZp6YuDY77YtvbN0dmDA==}
+    engines: {node: '>=8'}
+
+  shebang-regex@3.0.0:
+    resolution: {integrity: sha512-7++dFhtcx3353uBaq8DDR4NuxBetBzC7ZQOhmTQInHEd6bSrXdiEyzCvG07Z44UYdLShWUyXt5M/yhz8ekcb1A==}
+    engines: {node: '>=8'}
+
  source-map@0.7.6:
    resolution: {integrity: sha512-i5uvt8C3ikiWeNZSVZNWcfZPItFQOsYTUAOkcUPGd8DqDy1uOUikjt5dG+uRlwyvR108Fb9DOd4GvXfT0N2/uQ==}
    engines: {node: '>= 12'}
@ -503,6 +837,12 @@ packages:
    resolution: {integrity: sha512-L0Orpi8qGpRG//Nd+H90vFB+3iHnue1zSSGmNOOCh1GLJ7rUKVwV2HvijphGQS2UmhUZewS9VgvxYIdgr+fG1A==}
    hasBin: true

+  ts-api-utils@2.4.0:
+    resolution: {integrity: sha512-3TaVTaAv2gTiMB35i3FiGJaRfwb3Pyn/j3m/bfAvGe8FB7CF6u+LMYqYlDh7reQf7UNvoTvdfAqHGmPGOSsPmA==}
+    engines: {node: '>=18.12'}
+    peerDependencies:
+      typescript: '>=4.8.4'
+
  ts-interface-checker@0.1.13:
    resolution: {integrity: sha512-Y/arvbn+rrz3JCKl9C4kVNfTfSm2/mEp5FSz5EsZSANGPSlQrpRI5M4PKF+mJnE52jOO90PnPSc3Ur3bTQw0gA==}

@ -525,6 +865,17 @@ packages:
      typescript:
        optional: true

+  type-check@0.4.0:
+    resolution: {integrity: sha512-XleUoc9uwGXqjWwXaUTZAmzMcFZ5858QA2vvx1Ur5xIcixXIP+8LnFDgRplU30us6teqdlskFfu+ae4K79Ooew==}
+    engines: {node: '>= 0.8.0'}
+
+  typescript-eslint@8.56.1:
+    resolution: {integrity: sha512-U4lM6pjmBX7J5wk4szltF7I1cGBHXZopnAXCMXb3+fZ3B/0Z3hq3wS/CCUB2NZBNAExK92mCU2tEohWuwVMsDQ==}
+    engines: {node: ^18.18.0 || ^20.9.0 || >=21.1.0}
+    peerDependencies:
+      eslint: ^8.57.0 || ^9.0.0 || ^10.0.0
+      typescript: '>=4.8.4 <6.0.0'
+
  typescript@5.9.3:
    resolution: {integrity: sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw==}
    engines: {node: '>=14.17'}
@ -536,6 +887,22 @@ packages:
  undici-types@7.18.2:
    resolution: {integrity: sha512-AsuCzffGHJybSaRrmr5eHr81mwJU3kjw6M+uprWvCXiNeN9SOGwQ3Jn8jb8m3Z6izVgknn1R0FTCEAP2QrLY/w==}

+  uri-js@4.4.1:
+    resolution: {integrity: sha512-7rKUyy33Q1yc98pQ1DAmLtwX109F7TIfWlW1Ydo8Wl1ii1SeHieeh0HHfPeL2fMXK6z0s8ecKs9frCuLJvndBg==}
+
+  which@2.0.2:
+    resolution: {integrity: sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==}
+    engines: {node: '>= 8'}
+    hasBin: true
+
+  word-wrap@1.2.5:
+    resolution: {integrity: sha512-BN22B5eaMMI9UMtjrGd5g5eCYPpCPDUy0FJXbYsaT5zYxjFOckS53SQDE3pWkVoWpHXVb3BrYcEN4Twa55B5cA==}
+    engines: {node: '>=0.10.0'}
+
+  yocto-queue@0.1.0:
+    resolution: {integrity: sha512-rVksvsnNCdJ/ohGc6xgPwyN8eheCxsiLM8mxuE/t/mOVqJewPuO1miLpTHQiRgTKCLexL4MeAFVagts7HmNZ2Q==}
+    engines: {node: '>=10'}
+
 snapshots:

  '@esbuild/aix-ppc64@0.27.3':
@ -616,6 +983,51 @@ snapshots:
  '@esbuild/win32-x64@0.27.3':
    optional: true

+  '@eslint-community/eslint-utils@4.9.1(eslint@10.0.3)':
+    dependencies:
+      eslint: 10.0.3
+      eslint-visitor-keys: 3.4.3
+
+  '@eslint-community/regexpp@4.12.2': {}
+
+  '@eslint/config-array@0.23.3':
+    dependencies:
+      '@eslint/object-schema': 3.0.3
+      debug: 4.4.3
+      minimatch: 10.2.4
+    transitivePeerDependencies:
+      - supports-color
+
+  '@eslint/config-helpers@0.5.3':
+    dependencies:
+      '@eslint/core': 1.1.1
+
+  '@eslint/core@1.1.1':
+    dependencies:
+      '@types/json-schema': 7.0.15
+
+  '@eslint/js@10.0.1(eslint@10.0.3)':
+    optionalDependencies:
+      eslint: 10.0.3
+
+  '@eslint/object-schema@3.0.3': {}
+
+  '@eslint/plugin-kit@0.6.1':
+    dependencies:
+      '@eslint/core': 1.1.1
+      levn: 0.4.1
+
+  '@humanfs/core@0.19.1': {}
+
+  '@humanfs/node@0.16.7':
+    dependencies:
+      '@humanfs/core': 0.19.1
+      '@humanwhocodes/retry': 0.4.3
+
+  '@humanwhocodes/module-importer@1.0.1': {}
+
+  '@humanwhocodes/retry@0.4.3': {}
+
  '@jridgewell/gen-mapping@0.3.13':
    dependencies:
      '@jridgewell/sourcemap-codec': 1.5.5
@ -705,16 +1117,128 @@ snapshots:
  '@rollup/rollup-win32-x64-msvc@4.59.0':
    optional: true

+  '@types/esrecurse@4.3.1': {}
+
  '@types/estree@1.0.8': {}

+  '@types/json-schema@7.0.15': {}
+
  '@types/node@25.3.0':
    dependencies:
      undici-types: 7.18.2

+  '@typescript-eslint/eslint-plugin@8.56.1(@typescript-eslint/parser@8.56.1(eslint@10.0.3)(typescript@5.9.3))(eslint@10.0.3)(typescript@5.9.3)':
+    dependencies:
+      '@eslint-community/regexpp': 4.12.2
+      '@typescript-eslint/parser': 8.56.1(eslint@10.0.3)(typescript@5.9.3)
+      '@typescript-eslint/scope-manager': 8.56.1
+      '@typescript-eslint/type-utils': 8.56.1(eslint@10.0.3)(typescript@5.9.3)
+      '@typescript-eslint/utils': 8.56.1(eslint@10.0.3)(typescript@5.9.3)
+      '@typescript-eslint/visitor-keys': 8.56.1
+      eslint: 10.0.3
+      ignore: 7.0.5
+      natural-compare: 1.4.0
+      ts-api-utils: 2.4.0(typescript@5.9.3)
+      typescript: 5.9.3
+    transitivePeerDependencies:
+      - supports-color
+
+  '@typescript-eslint/parser@8.56.1(eslint@10.0.3)(typescript@5.9.3)':
+    dependencies:
+      '@typescript-eslint/scope-manager': 8.56.1
+      '@typescript-eslint/types': 8.56.1
+      '@typescript-eslint/typescript-estree': 8.56.1(typescript@5.9.3)
+      '@typescript-eslint/visitor-keys': 8.56.1
+      debug: 4.4.3
+      eslint: 10.0.3
+      typescript: 5.9.3
+    transitivePeerDependencies:
+      - supports-color
+
+  '@typescript-eslint/project-service@8.56.1(typescript@5.9.3)':
+    dependencies:
+      '@typescript-eslint/tsconfig-utils': 8.56.1(typescript@5.9.3)
+      '@typescript-eslint/types': 8.56.1
+      debug: 4.4.3
+      typescript: 5.9.3
+    transitivePeerDependencies:
+      - supports-color
+
+  '@typescript-eslint/scope-manager@8.56.1':
+    dependencies:
+      '@typescript-eslint/types': 8.56.1
+      '@typescript-eslint/visitor-keys': 8.56.1
+
+  '@typescript-eslint/tsconfig-utils@8.56.1(typescript@5.9.3)':
+    dependencies:
+      typescript: 5.9.3
+
+  '@typescript-eslint/type-utils@8.56.1(eslint@10.0.3)(typescript@5.9.3)':
+    dependencies:
+      '@typescript-eslint/types': 8.56.1
+      '@typescript-eslint/typescript-estree': 8.56.1(typescript@5.9.3)
+      '@typescript-eslint/utils': 8.56.1(eslint@10.0.3)(typescript@5.9.3)
+      debug: 4.4.3
+      eslint: 10.0.3
+      ts-api-utils: 2.4.0(typescript@5.9.3)
+      typescript: 5.9.3
+    transitivePeerDependencies:
+      - supports-color
+
+  '@typescript-eslint/types@8.56.1': {}
+
+  '@typescript-eslint/typescript-estree@8.56.1(typescript@5.9.3)':
+    dependencies:
+      '@typescript-eslint/project-service': 8.56.1(typescript@5.9.3)
+      '@typescript-eslint/tsconfig-utils': 8.56.1(typescript@5.9.3)
+      '@typescript-eslint/types': 8.56.1
+      '@typescript-eslint/visitor-keys': 8.56.1
+      debug: 4.4.3
+      minimatch: 10.2.4
+      semver: 7.7.4
+      tinyglobby: 0.2.15
+      ts-api-utils: 2.4.0(typescript@5.9.3)
+      typescript: 5.9.3
+    transitivePeerDependencies:
+      - supports-color
+
+  '@typescript-eslint/utils@8.56.1(eslint@10.0.3)(typescript@5.9.3)':
+    dependencies:
+      '@eslint-community/eslint-utils': 4.9.1(eslint@10.0.3)
+      '@typescript-eslint/scope-manager': 8.56.1
+      '@typescript-eslint/types': 8.56.1
+      '@typescript-eslint/typescript-estree': 8.56.1(typescript@5.9.3)
+      eslint: 10.0.3
+      typescript: 5.9.3
+    transitivePeerDependencies:
+      - supports-color
+
+  '@typescript-eslint/visitor-keys@8.56.1':
+    dependencies:
+      '@typescript-eslint/types': 8.56.1
+      eslint-visitor-keys: 5.0.1
+
+  acorn-jsx@5.3.2(acorn@8.16.0):
+    dependencies:
+      acorn: 8.16.0
+
  acorn@8.16.0: {}

+  ajv@6.14.0:
+    dependencies:
+      fast-deep-equal: 3.1.3
+      fast-json-stable-stringify: 2.1.0
+      json-schema-traverse: 0.4.1
+      uri-js: 4.4.1
+
  any-promise@1.3.0: {}

+  balanced-match@4.0.4: {}
+
+  brace-expansion@5.0.4:
+    dependencies:
+      balanced-match: 4.0.4
+
  bundle-require@5.1.0(esbuild@0.27.3):
    dependencies:
      esbuild: 0.27.3
@ -732,10 +1256,18 @@ snapshots:

  consola@3.4.2: {}

+  cross-spawn@7.0.6:
+    dependencies:
+      path-key: 3.1.1
+      shebang-command: 2.0.0
+      which: 2.0.2
+
  debug@4.4.3:
    dependencies:
      ms: 2.1.3

+  deep-is@0.1.4: {}
+
  esbuild@0.27.3:
    optionalDependencies:
      '@esbuild/aix-ppc64': 0.27.3
@ -765,31 +1297,164 @@ snapshots:
      '@esbuild/win32-ia32': 0.27.3
      '@esbuild/win32-x64': 0.27.3

+  escape-string-regexp@4.0.0: {}
+
+  eslint-config-prettier@10.1.8(eslint@10.0.3):
+    dependencies:
+      eslint: 10.0.3
+
+  eslint-scope@9.1.2:
+    dependencies:
+      '@types/esrecurse': 4.3.1
+      '@types/estree': 1.0.8
+      esrecurse: 4.3.0
+      estraverse: 5.3.0
+
+  eslint-visitor-keys@3.4.3: {}
+
+  eslint-visitor-keys@5.0.1: {}
+
+  eslint@10.0.3:
+    dependencies:
+      '@eslint-community/eslint-utils': 4.9.1(eslint@10.0.3)
+      '@eslint-community/regexpp': 4.12.2
+      '@eslint/config-array': 0.23.3
+      '@eslint/config-helpers': 0.5.3
+      '@eslint/core': 1.1.1
+      '@eslint/plugin-kit': 0.6.1
+      '@humanfs/node': 0.16.7
+      '@humanwhocodes/module-importer': 1.0.1
+      '@humanwhocodes/retry': 0.4.3
+      '@types/estree': 1.0.8
+      ajv: 6.14.0
+      cross-spawn: 7.0.6
+      debug: 4.4.3
+      escape-string-regexp: 4.0.0
+      eslint-scope: 9.1.2
+      eslint-visitor-keys: 5.0.1
+      espree: 11.2.0
+      esquery: 1.7.0
+      esutils: 2.0.3
+      fast-deep-equal: 3.1.3
+      file-entry-cache: 8.0.0
+      find-up: 5.0.0
+      glob-parent: 6.0.2
+      ignore: 5.3.2
+      imurmurhash: 0.1.4
+      is-glob: 4.0.3
+      json-stable-stringify-without-jsonify: 1.0.1
+      minimatch: 10.2.4
+      natural-compare: 1.4.0
+      optionator: 0.9.4
+    transitivePeerDependencies:
+      - supports-color
+
+  espree@11.2.0:
+    dependencies:
+      acorn: 8.16.0
+      acorn-jsx: 5.3.2(acorn@8.16.0)
+      eslint-visitor-keys: 5.0.1
+
+  esquery@1.7.0:
+    dependencies:
+      estraverse: 5.3.0
+
+  esrecurse@4.3.0:
+    dependencies:
+      estraverse: 5.3.0
+
+  estraverse@5.3.0: {}
+
+  esutils@2.0.3: {}
+
+  fast-deep-equal@3.1.3: {}
+
+  fast-json-stable-stringify@2.1.0: {}
+
+  fast-levenshtein@2.0.6: {}
+
  fdir@6.5.0(picomatch@4.0.3):
    optionalDependencies:
      picomatch: 4.0.3

+  file-entry-cache@8.0.0:
+    dependencies:
+      flat-cache: 4.0.1
+
+  find-up@5.0.0:
+    dependencies:
+      locate-path: 6.0.0
+      path-exists: 4.0.0
+
  fix-dts-default-cjs-exports@1.0.1:
    dependencies:
      magic-string: 0.30.21
      mlly: 1.8.0
      rollup: 4.59.0

+  flat-cache@4.0.1:
+    dependencies:
+      flatted: 3.3.4
+      keyv: 4.5.4
+
+  flatted@3.3.4: {}
+
  fsevents@2.3.3:
    optional: true

+  glob-parent@6.0.2:
+    dependencies:
+      is-glob: 4.0.3
+
+  ignore@5.3.2: {}
+
+  ignore@7.0.5: {}
+
+  imurmurhash@0.1.4: {}
+
+  is-extglob@2.1.1: {}
+
+  is-glob@4.0.3:
+    dependencies:
+      is-extglob: 2.1.1
+
+  isexe@2.0.0: {}
+
  joycon@3.1.1: {}

+  json-buffer@3.0.1: {}
+
+  json-schema-traverse@0.4.1: {}
+
+  json-stable-stringify-without-jsonify@1.0.1: {}
+
+  keyv@4.5.4:
+    dependencies:
+      json-buffer: 3.0.1
+
+  levn@0.4.1:
+    dependencies:
+      prelude-ls: 1.2.1
+      type-check: 0.4.0
+
  lilconfig@3.1.3: {}

  lines-and-columns@1.2.4: {}

  load-tsconfig@0.2.5: {}

+  locate-path@6.0.0:
+    dependencies:
+      p-locate: 5.0.0
+
  magic-string@0.30.21:
    dependencies:
      '@jridgewell/sourcemap-codec': 1.5.5

+  minimatch@10.2.4:
+    dependencies:
+      brace-expansion: 5.0.4
+
  mlly@1.8.0:
    dependencies:
      acorn: 8.16.0
@ -805,8 +1470,31 @@ snapshots:
      object-assign: 4.1.1
      thenify-all: 1.6.0

+  natural-compare@1.4.0: {}
+
  object-assign@4.1.1: {}

+  optionator@0.9.4:
+    dependencies:
+      deep-is: 0.1.4
+      fast-levenshtein: 2.0.6
+      levn: 0.4.1
+      prelude-ls: 1.2.1
+      type-check: 0.4.0
+      word-wrap: 1.2.5
+
+  p-limit@3.1.0:
+    dependencies:
+      yocto-queue: 0.1.0
+
+  p-locate@5.0.0:
+    dependencies:
+      p-limit: 3.1.0
+
+  path-exists@4.0.0: {}
+
+  path-key@3.1.1: {}
+
  pathe@2.0.3: {}

  picocolors@1.1.1: {}
@ -825,6 +1513,12 @@ snapshots:
    dependencies:
      lilconfig: 3.1.3

+  prelude-ls@1.2.1: {}
+
+  prettier@3.8.1: {}
+
+  punycode@2.3.1: {}
+
  readdirp@4.1.2: {}

  resolve-from@5.0.0: {}
@ -860,6 +1554,14 @@ snapshots:
      '@rollup/rollup-win32-x64-msvc': 4.59.0
      fsevents: 2.3.3

+  semver@7.7.4: {}
+
+  shebang-command@2.0.0:
+    dependencies:
+      shebang-regex: 3.0.0
+
+  shebang-regex@3.0.0: {}
+
  source-map@0.7.6: {}

  sucrase@3.35.1:
@ -889,6 +1591,10 @@ snapshots:

  tree-kill@1.2.2: {}

+  ts-api-utils@2.4.0(typescript@5.9.3):
+    dependencies:
+      typescript: 5.9.3
+
  ts-interface-checker@0.1.13: {}

  tsup@8.5.1(typescript@5.9.3):
@ -918,8 +1624,35 @@ snapshots:
      - tsx
      - yaml

+  type-check@0.4.0:
+    dependencies:
+      prelude-ls: 1.2.1
+
+  typescript-eslint@8.56.1(eslint@10.0.3)(typescript@5.9.3):
+    dependencies:
+      '@typescript-eslint/eslint-plugin': 8.56.1(@typescript-eslint/parser@8.56.1(eslint@10.0.3)(typescript@5.9.3))(eslint@10.0.3)(typescript@5.9.3)
+      '@typescript-eslint/parser': 8.56.1(eslint@10.0.3)(typescript@5.9.3)
+      '@typescript-eslint/typescript-estree': 8.56.1(typescript@5.9.3)
+      '@typescript-eslint/utils': 8.56.1(eslint@10.0.3)(typescript@5.9.3)
+      eslint: 10.0.3
+      typescript: 5.9.3
+    transitivePeerDependencies:
+      - supports-color
+
  typescript@5.9.3: {}

  ufo@1.6.3: {}

  undici-types@7.18.2: {}
+
+  uri-js@4.4.1:
+    dependencies:
+      punycode: 2.3.1
+
+  which@2.0.2:
+    dependencies:
+      isexe: 2.0.0
+
+  word-wrap@1.2.5: {}
+
+  yocto-queue@0.1.0: {}
--- a/src/api/index.ts
+++ b/src/api/index.ts
@ -31,11 +31,7 @@ import type {
 } from '../types.js'
 import { ODEH_THRESHOLDS, ODEH_DESCRIPTIONS } from '../types.js'
 import { SpkKernel } from '../spk/index.js'
-import {
-  computeTimeScales,
-  jdTTtoET,
-  J2000,
-} from '../time/index.js'
+import { computeTimeScales, jdTTtoET, jdToDate, J2000 } from '../time/index.js'
 import {
  getMoonGeocentricState,
  getSunGeocentricState,
@ -44,10 +40,7 @@ import {
  getMoonSunApproximate,
  nearestNewMoon,
 } from '../bodies/index.js'
-import {
-  geodeticToECEF,
-  computeAzAlt,
-} from '../observer/index.js'
+import { geodeticToECEF, computeAzAlt } from '../observer/index.js'
 import { itrsToGcrs, computeERA } from '../frames/index.js'
 import {
  getSunMoonEvents as eventsGetSunMoonEvents,
@ -60,7 +53,34 @@ import {
  computeYallop,
  computeOdeh,
  buildGuidanceText,
+  arcvMinimum,
 } from '../visibility/index.js'
+import { DEG2RAD } from '../math/index.js'
+
+// ─── Input validation ─────────────────────────────────────────────────────────
+
+function validateDate(date: Date, label: string): void {
+  if (!(date instanceof Date) || isNaN(date.getTime())) {
+    throw new RangeError(`${label}: expected a valid Date instance`)
+  }
+}
+
+function validateLatitude(lat: number, label: string): void {
+  if (!isFinite(lat) || lat < -90 || lat > 90) {
+    throw new RangeError(`${label}: latitude must be a finite number in [-90, 90], got ${lat}`)
+  }
+}
+
+function validateLongitude(lon: number, label: string): void {
+  if (!isFinite(lon) || lon < -180 || lon > 180) {
+    throw new RangeError(`${label}: longitude must be a finite number in [-180, 180], got ${lon}`)
+  }
+}
+
+function validateObserver(observer: Observer, label: string): void {
+  validateLatitude(observer.lat, label)
+  validateLongitude(observer.lon, label)
+}

 // ─── Module-level kernel singleton ─────────────────────────────────────────────

@ -83,7 +103,7 @@ function resolveCacheDir(override?: string): string {
 // ─── Download sources ─────────────────────────────────────────────────────────

 const NAIF_DE442S_URL = 'https://naif.jpl.nasa.gov/pub/naif/generic_kernels/spk/planets/de442s.bsp'
-const NAIF_LSK_URL    = 'https://naif.jpl.nasa.gov/pub/naif/generic_kernels/lsk/naif0012.tls'
+const NAIF_LSK_URL = 'https://naif.jpl.nasa.gov/pub/naif/generic_kernels/lsk/naif0012.tls'

 // ─── Kernel lifecycle ─────────────────────────────────────────────────────────

@ -109,7 +129,8 @@ export async function initKernels(config?: KernelConfig): Promise<void> {
    buffer = source.data
  } else if (source.type === 'url') {
    const res = await fetch(source.url)
-    if (!res.ok) throw new Error(`Failed to fetch kernel from ${source.url}: ${res.status} ${res.statusText}`)
+    if (!res.ok)
+      throw new Error(`Failed to fetch kernel from ${source.url}: ${res.status} ${res.statusText}`)
    buffer = await res.arrayBuffer()
  } else {
    // auto: download to local cache, then load
@ -146,7 +167,7 @@ export async function downloadKernels(config?: KernelConfig): Promise<{

  await mkdir(cacheDir, { recursive: true })

-  const planetaryPath  = join(cacheDir, 'de442s.bsp')
+  const planetaryPath = join(cacheDir, 'de442s.bsp')
  const leapSecondsPath = join(cacheDir, 'naif0012.tls')

  if (!existsSync(planetaryPath)) {
@ -206,7 +227,7 @@ export async function verifyKernels(config?: KernelConfig): Promise<{
  const { join } = await import('node:path')
  const errors: string[] = []

-  const planetaryPath  = join(cacheDir, 'de442s.bsp')
+  const planetaryPath = join(cacheDir, 'de442s.bsp')
  const leapSecondsPath = join(cacheDir, 'naif0012.tls')

  if (!existsSync(planetaryPath)) {
@ -251,7 +272,8 @@ async function resolveKernel(config?: KernelConfig): Promise<SpkKernel> {

  // auto-init as last resort
  await initKernels(config)
-  if (!activeKernel) throw new Error('Kernel failed to initialize. Call initKernels() before computing.')
+  if (!activeKernel)
+    throw new Error('Kernel failed to initialize. Call initKernels() before computing.')
  return activeKernel
 }

@ -286,6 +308,8 @@ export async function getMoonSightingReport(
  observer: Observer,
  options?: SightingOptions,
 ): Promise<MoonSightingReport> {
+  validateDate(date, 'getMoonSightingReport')
+  validateObserver(observer, 'getMoonSightingReport')
  const kernel = await resolveKernel(options?.kernels)

  // Event times (sunset, moonset, twilight, rise)
@ -321,7 +345,7 @@ export async function getMoonSightingReport(

  // Body positions in GCRS (geocentric)
  const moonGCRS = getMoonGeocentricState(kernel, et).position
-  const sunGCRS  = getSunGeocentricState(kernel, et).position
+  const sunGCRS = getSunGeocentricState(kernel, et).position

  // Observer ITRS position (km) from geodetic coordinates
  const obsECEF = geodeticToECEF(observer.lat, observer.lon, observer.elevation)
@ -333,7 +357,7 @@ export async function getMoonSightingReport(

  // Airless alt/az — required by Yallop/Odeh criteria
  const moonAirless = computeAzAlt(moonGCRS, observer, ts, true)
-  const sunAirless  = computeAzAlt(sunGCRS,  observer, ts, true)
+  const sunAirless = computeAzAlt(sunGCRS, observer, ts, true)
  // Apparent alt/az (with refraction) — for guidance text
  const moonApparent = computeAzAlt(moonGCRS, observer, ts, false)

@ -349,11 +373,7 @@ export async function getMoonSightingReport(
    moonGCRS[1] - obsGCRS[1],
    moonGCRS[2] - obsGCRS[2],
  ]
-  const sunTopo: Vec3 = [
-    sunGCRS[0] - obsGCRS[0],
-    sunGCRS[1] - obsGCRS[1],
-    sunGCRS[2] - obsGCRS[2],
-  ]
+  const sunTopo: Vec3 = [sunGCRS[0] - obsGCRS[0], sunGCRS[1] - obsGCRS[1], sunGCRS[2] - obsGCRS[2]]

  const geometry = computeCrescentGeometry(
    moonAirless,
@ -366,7 +386,7 @@ export async function getMoonSightingReport(

  const { Wprime } = computeCrescentWidth(moonTopo, geometry.ARCL)
  const yallop = computeYallop(geometry, Wprime)
-  const odeh   = computeOdeh(geometry)
+  const odeh = computeOdeh(geometry)

  const moonAboveHorizon = moonAirless.altitude > 0
  const sightingPossible = moonAboveHorizon && lagMinutes > 0
@ -413,7 +433,7 @@ function buildNullReport(
  return {
    date,
    observer,
-    sunsetUTC:  events.sunsetUTC,
+    sunsetUTC: events.sunsetUTC,
    moonsetUTC: events.moonsetUTC,
    lagMinutes: null,
    bestTimeUTC: null,
@ -425,7 +445,8 @@ function buildNullReport(
    geometry: null,
    yallop: null,
    odeh: null,
-    guidance: 'Sighting not possible: sunset or moonset could not be determined for this date and location.',
+    guidance:
+      'Sighting not possible: sunset or moonset could not be determined for this date and location.',
    ephemerisSource: source,
    moonAboveHorizon: null,
    sightingPossible,
@ -435,14 +456,14 @@ function buildNullReport(
 // ─── Phase display lookup ──────────────────────────────────────────────────────

 const PHASE_DISPLAY: Record<MoonPhaseName, { name: string; symbol: string }> = {
-  'new-moon':        { name: 'New Moon',        symbol: '🌑' },
+  'new-moon': { name: 'New Moon', symbol: '🌑' },
  'waxing-crescent': { name: 'Waxing Crescent', symbol: '🌒' },
-  'first-quarter':   { name: 'First Quarter',   symbol: '🌓' },
-  'waxing-gibbous':  { name: 'Waxing Gibbous',  symbol: '🌔' },
-  'full-moon':       { name: 'Full Moon',        symbol: '🌕' },
-  'waning-gibbous':  { name: 'Waning Gibbous',  symbol: '🌖' },
-  'last-quarter':    { name: 'Last Quarter',     symbol: '🌗' },
-  'waning-crescent': { name: 'Waning Crescent',  symbol: '🌘' },
+  'first-quarter': { name: 'First Quarter', symbol: '🌓' },
+  'waxing-gibbous': { name: 'Waxing Gibbous', symbol: '🌔' },
+  'full-moon': { name: 'Full Moon', symbol: '🌕' },
+  'waning-gibbous': { name: 'Waning Gibbous', symbol: '🌖' },
+  'last-quarter': { name: 'Last Quarter', symbol: '🌗' },
+  'waning-crescent': { name: 'Waning Crescent', symbol: '🌘' },
 }

 /**
@ -464,6 +485,7 @@ const PHASE_DISPLAY: Record<MoonPhaseName, { name: string; symbol: string }> = {
 * ```
 */
 export function getMoonPhase(date = new Date()): MoonPhaseResult {
+  validateDate(date, 'getMoonPhase')
  const ts = computeTimeScales(date)
  const { moonGCRS, sunGCRS } = getMoonSunApproximate(ts.jdTT)

@ -478,7 +500,7 @@ export function getMoonPhase(date = new Date()): MoonPhaseResult {
  const phaseKey = elongationToPhase(elongationDeg, isWaxing)
  const { name: phaseName, symbol: phaseSymbol } = PHASE_DISPLAY[phaseKey]

-  const nextNewMoonJD  = nearestNewMoon(ts.jdTT + 15)
+  const nextNewMoonJD = nearestNewMoon(ts.jdTT + 15)
  const nextFullMoonJD = nearestFullMoon(ts.jdTT)

  return {
@ -489,9 +511,9 @@ export function getMoonPhase(date = new Date()): MoonPhaseResult {
    age,
    elongationDeg,
    isWaxing,
-    nextNewMoon:  jdToJSDate(nextNewMoonJD),
-    nextFullMoon: jdToJSDate(nextFullMoonJD),
-    prevNewMoon:  jdToJSDate(prevNewMoonJD),
+    nextNewMoon: jdToDate(nextNewMoonJD),
+    nextFullMoon: jdToDate(nextFullMoonJD),
+    prevNewMoon: jdToDate(prevNewMoonJD),
  }
 }

@ -520,7 +542,9 @@ export function getMoonPosition(
  lon: number,
  elevation = 0,
 ): MoonPosition {
-  const DEG = Math.PI / 180
+  validateDate(date, 'getMoonPosition')
+  validateLatitude(lat, 'getMoonPosition')
+  validateLongitude(lon, 'getMoonPosition')
  const ts = computeTimeScales(date)
  const { moonGCRS } = getMoonSunApproximate(ts.jdTT)

@ -532,17 +556,17 @@ export function getMoonPosition(
  const distance = Math.sqrt(moonGCRS[0] ** 2 + moonGCRS[1] ** 2 + moonGCRS[2] ** 2)

  // Equatorial coordinates for parallactic angle
-  const RA_moon  = Math.atan2(moonGCRS[1], moonGCRS[0])
+  const RA_moon = Math.atan2(moonGCRS[1], moonGCRS[0])
  const dec_moon = Math.asin(Math.max(-1, Math.min(1, moonGCRS[2] / distance)))

  // Hour angle: ERA(UT1) + longitude − right ascension
  const era = computeERA(ts.jdUT1)
-  const HA  = era + lon * DEG - RA_moon
+  const HA = era + lon * DEG2RAD - RA_moon

  // Parallactic angle: signed angle between zenith and north pole as seen from the Moon
  const parallacticAngle = Math.atan2(
    Math.sin(HA),
-    Math.cos(lat * DEG) * Math.tan(dec_moon) - Math.sin(lat * DEG) * Math.cos(HA),
+    Math.cos(lat * DEG2RAD) * Math.tan(dec_moon) - Math.sin(lat * DEG2RAD) * Math.cos(HA),
  )

  return { azimuth: azAlt.azimuth, altitude: azAlt.altitude, distance, parallacticAngle }
@ -566,6 +590,7 @@ export function getMoonPosition(
 * ```
 */
 export function getMoonIllumination(date: Date = new Date()): MoonIlluminationResult {
+  validateDate(date, 'getMoonIllumination')
  const ts = computeTimeScales(date)
  const { moonGCRS, sunGCRS } = getMoonSunApproximate(ts.jdTT)

@ -578,12 +603,12 @@ export function getMoonIllumination(date: Date = new Date()): MoonIlluminationRe
  // PA = atan2(cos(dec_sun) * sin(RA_sun - RA_moon),
  //            sin(dec_sun) * cos(dec_moon) - cos(dec_sun) * sin(dec_moon) * cos(RA_sun - RA_moon))
  const moonDist = Math.sqrt(moonGCRS[0] ** 2 + moonGCRS[1] ** 2 + moonGCRS[2] ** 2)
-  const sunDist  = Math.sqrt(sunGCRS[0]  ** 2 + sunGCRS[1]  ** 2 + sunGCRS[2]  ** 2)
+  const sunDist = Math.sqrt(sunGCRS[0] ** 2 + sunGCRS[1] ** 2 + sunGCRS[2] ** 2)

-  const RA_moon  = Math.atan2(moonGCRS[1], moonGCRS[0])
+  const RA_moon = Math.atan2(moonGCRS[1], moonGCRS[0])
  const dec_moon = Math.asin(Math.max(-1, Math.min(1, moonGCRS[2] / moonDist)))
-  const RA_sun   = Math.atan2(sunGCRS[1],  sunGCRS[0])
-  const dec_sun  = Math.asin(Math.max(-1, Math.min(1, sunGCRS[2]  / sunDist)))
+  const RA_sun = Math.atan2(sunGCRS[1], sunGCRS[0])
+  const dec_sun = Math.asin(Math.max(-1, Math.min(1, sunGCRS[2] / sunDist)))

  const dRA = RA_sun - RA_moon
  const angle = Math.atan2(
@ -625,13 +650,16 @@ export function getMoonVisibilityEstimate(
  lon: number,
  elevation = 0,
 ): MoonVisibilityEstimate {
+  validateDate(date, 'getMoonVisibilityEstimate')
+  validateLatitude(lat, 'getMoonVisibilityEstimate')
+  validateLongitude(lon, 'getMoonVisibilityEstimate')
  const ts = computeTimeScales(date)
  const { moonGCRS, sunGCRS } = getMoonSunApproximate(ts.jdTT)
  const observer: Observer = { lat, lon, elevation }

  // Airless positions — Odeh uses airless altitudes (no refraction)
  const moonAirless = computeAzAlt(moonGCRS, observer, ts, true)
-  const sunAirless  = computeAzAlt(sunGCRS,  observer, ts, true)
+  const sunAirless = computeAzAlt(sunGCRS, observer, ts, true)

  // ARCL = elongation (geocentric, degrees)
  const { elongationDeg } = computeIllumination(moonGCRS, sunGCRS)
@ -652,14 +680,11 @@ export function getMoonVisibilityEstimate(

  const { W } = computeCrescentWidth(moonTopo, ARCL)

-  // Odeh 2006: V = ARCV - f(W), where f(W) = arcv_minimum polynomial
-  const arcvMin = -0.1018 * W ** 3 + 0.7319 * W ** 2 - 6.3226 * W + 7.1651
-  const V = ARCV - arcvMin
+  // Odeh 2006: V = ARCV - arcv_minimum(W)
+  const V = ARCV - arcvMinimum(W)

-  const zone: OdehZone = V >= ODEH_THRESHOLDS.A ? 'A'
-    : V >= ODEH_THRESHOLDS.B ? 'B'
-    : V >= ODEH_THRESHOLDS.C ? 'C'
-    : 'D'
+  const zone: OdehZone =
+    V >= ODEH_THRESHOLDS.A ? 'A' : V >= ODEH_THRESHOLDS.B ? 'B' : V >= ODEH_THRESHOLDS.C ? 'C' : 'D'

  return {
    V,
@ -705,21 +730,19 @@ export function getMoon(
  lon: number,
  elevation = 0,
 ): MoonSnapshot {
+  validateDate(date, 'getMoon')
+  validateLatitude(lat, 'getMoon')
+  validateLongitude(lon, 'getMoon')
  return {
-    phase:        getMoonPhase(date),
-    position:     getMoonPosition(date, lat, lon, elevation),
+    phase: getMoonPhase(date),
+    position: getMoonPosition(date, lat, lon, elevation),
    illumination: getMoonIllumination(date),
-    visibility:   getMoonVisibilityEstimate(date, lat, lon, elevation),
+    visibility: getMoonVisibilityEstimate(date, lat, lon, elevation),
  }
 }

 // ─── Internal helpers ─────────────────────────────────────────────────────────

-/** Convert JD to a UTC Date. */
-function jdToJSDate(jd: number): Date {
-  return new Date((jd - 2440587.5) * 86400000)
-}
-
 /**
 * Approximate the nearest full moon JD using Meeus Ch. 49 (full moon k = n + 0.5).
 * Full moon corrections differ from new moon; these are from Meeus Table 49.A.
@ -740,46 +763,46 @@ function nearestFullMoon(jdTT: number): number {
 /** Full moon JDE for a half-integer k (Meeus Ch. 49, Table 49.A). */
 function fullMoonJDE(k: number): number {
  const T = k / 1236.85
-  const DEG = Math.PI / 180

-  let JDE = 2451550.09766
-    + 29.530588861 * k
-    + 0.00015437 * T * T
-    - 0.000000150 * T * T * T
-    + 0.00000000073 * T * T * T * T
+  let JDE =
+    2451550.09766 +
+    29.530588861 * k +
+    0.00015437 * T * T -
+    0.00000015 * T * T * T +
+    0.00000000073 * T * T * T * T

-  const M  = (2.5534 + 29.10535670 * k - 0.0000014 * T * T) * DEG
-  const Mp = (201.5643 + 385.81693528 * k + 0.0107582 * T * T) * DEG
-  const Fc = (160.7108 + 390.67050284 * k - 0.0016118 * T * T) * DEG
-  const Om = (124.7746 - 1.56375588 * k + 0.0020672 * T * T) * DEG
-  const E  = 1 - 0.002516 * T - 0.0000074 * T * T
+  const M = (2.5534 + 29.1053567 * k - 0.0000014 * T * T) * DEG2RAD
+  const Mp = (201.5643 + 385.81693528 * k + 0.0107582 * T * T) * DEG2RAD
+  const Fc = (160.7108 + 390.67050284 * k - 0.0016118 * T * T) * DEG2RAD
+  const Om = (124.7746 - 1.56375588 * k + 0.0020672 * T * T) * DEG2RAD
+  const E = 1 - 0.002516 * T - 0.0000074 * T * T

  JDE +=
-    -0.40614 * Math.sin(Mp)
-    + 0.17302 * E * Math.sin(M)
-    + 0.01614 * Math.sin(2 * Mp)
-    + 0.01043 * Math.sin(2 * Fc)
-    + 0.00734 * E * Math.sin(Mp - M)
-    - 0.00515 * E * Math.sin(Mp + M)
-    + 0.00209 * E * E * Math.sin(2 * M)
-    - 0.00111 * Math.sin(Mp - 2 * Fc)
-    - 0.00057 * Math.sin(Mp + 2 * Fc)
-    + 0.00056 * E * Math.sin(2 * Mp + M)
-    - 0.00042 * Math.sin(3 * Mp)
-    + 0.00042 * E * Math.sin(M + 2 * Fc)
-    + 0.00038 * E * Math.sin(M - 2 * Fc)
-    - 0.00024 * E * Math.sin(2 * Mp - M)
-    - 0.00017 * Math.sin(Om)
-    - 0.00007 * Math.sin(Mp + 2 * M)
-    + 0.00004 * Math.sin(2 * Mp - 2 * Fc)
-    + 0.00004 * Math.sin(3 * M)
-    + 0.00003 * Math.sin(Mp + M - 2 * Fc)
-    + 0.00003 * Math.sin(2 * Mp + 2 * Fc)
-    - 0.00003 * Math.sin(Mp + M + 2 * Fc)
-    + 0.00003 * Math.sin(Mp - M + 2 * Fc)
-    - 0.00002 * Math.sin(Mp - M - 2 * Fc)
-    - 0.00002 * Math.sin(3 * Mp + M)
-    + 0.00002 * Math.sin(4 * Mp)
+    -0.40614 * Math.sin(Mp) +
+    0.17302 * E * Math.sin(M) +
+    0.01614 * Math.sin(2 * Mp) +
+    0.01043 * Math.sin(2 * Fc) +
+    0.00734 * E * Math.sin(Mp - M) -
+    0.00515 * E * Math.sin(Mp + M) +
+    0.00209 * E * E * Math.sin(2 * M) -
+    0.00111 * Math.sin(Mp - 2 * Fc) -
+    0.00057 * Math.sin(Mp + 2 * Fc) +
+    0.00056 * E * Math.sin(2 * Mp + M) -
+    0.00042 * Math.sin(3 * Mp) +
+    0.00042 * E * Math.sin(M + 2 * Fc) +
+    0.00038 * E * Math.sin(M - 2 * Fc) -
+    0.00024 * E * Math.sin(2 * Mp - M) -
+    0.00017 * Math.sin(Om) -
+    0.00007 * Math.sin(Mp + 2 * M) +
+    0.00004 * Math.sin(2 * Mp - 2 * Fc) +
+    0.00004 * Math.sin(3 * M) +
+    0.00003 * Math.sin(Mp + M - 2 * Fc) +
+    0.00003 * Math.sin(2 * Mp + 2 * Fc) -
+    0.00003 * Math.sin(Mp + M + 2 * Fc) +
+    0.00003 * Math.sin(Mp - M + 2 * Fc) -
+    0.00002 * Math.sin(Mp - M - 2 * Fc) -
+    0.00002 * Math.sin(3 * Mp + M) +
+    0.00002 * Math.sin(4 * Mp)

  return JDE
 }
@ -790,10 +813,10 @@ function fullMoonJDE(k: number): number {
 */
 function elongationToPhase(elongationDeg: number, isWaxing: boolean): MoonPhaseName {
  const e = elongationDeg
-  if (e < 5)   return 'new-moon'
+  if (e < 5) return 'new-moon'
  if (e > 175) return 'full-moon'
-  if (e < 85)  return isWaxing ? 'waxing-crescent' : 'waning-crescent'
-  if (e < 95)  return isWaxing ? 'first-quarter'   : 'last-quarter'
+  if (e < 85) return isWaxing ? 'waxing-crescent' : 'waning-crescent'
+  if (e < 95) return isWaxing ? 'first-quarter' : 'last-quarter'
  return isWaxing ? 'waxing-gibbous' : 'waning-gibbous'
 }

@ -812,6 +835,8 @@ export async function getSunMoonEvents(
  observer: Observer,
  options?: Pick<SightingOptions, 'kernels'>,
 ): Promise<SunMoonEvents> {
+  validateDate(date, 'getSunMoonEvents')
+  validateObserver(observer, 'getSunMoonEvents')
  const kernel = await resolveKernel(options?.kernels)
  return eventsGetSunMoonEvents(date, observer, kernel)
 }
--- a/src/bodies/index.ts
+++ b/src/bodies/index.ts
@ -20,17 +20,17 @@ import type { StateVector, Vec3 } from '../types.js'
 import type { SpkKernel } from '../spk/index.js'
 import { NAIF_IDS } from '../spk/index.js'
 import { J2000, DAYS_PER_JULIAN_CENTURY } from '../time/index.js'
+import { DEG2RAD, vdot, vnorm } from '../math/index.js'

 // ─── Constants ────────────────────────────────────────────────────────────────
-
-const DEG = Math.PI / 180
 const AU_KM = 149597870.7

 /** Mean radius of the Moon in km (IAU 2015 nominal value) */
 const MOON_RADIUS_KM = 1737.4

 /** Mean radius of the Sun in km */
-const SUN_RADIUS_KM = 696000.0
+const _SUN_RADIUS_KM = 696000.0
+void _SUN_RADIUS_KM // reserved for future solar semi-diameter calculations

 // ─── Geocentric state ─────────────────────────────────────────────────────────

@ -85,15 +85,12 @@ export function computeIllumination(
  moonGCRS: Vec3,
  sunGCRS: Vec3,
 ): { illumination: number; phaseAngleDeg: number; elongationDeg: number; isWaxing: boolean } {
-  const dot = (a: Vec3, b: Vec3) => a[0]*b[0] + a[1]*b[1] + a[2]*b[2]
-  const norm = (v: Vec3) => Math.sqrt(dot(v, v))
-
-  const rMoon = norm(moonGCRS)
-  const rSun = norm(sunGCRS)
+  const rMoon = vnorm(moonGCRS)
+  const rSun = vnorm(sunGCRS)

  // Elongation ψ: angle at Earth between Moon and Sun
-  const cosElong = dot(moonGCRS, sunGCRS) / (rMoon * rSun)
-  const elongationDeg = Math.acos(Math.max(-1, Math.min(1, cosElong))) / DEG
+  const cosElong = vdot(moonGCRS, sunGCRS) / (rMoon * rSun)
+  const elongationDeg = Math.acos(Math.max(-1, Math.min(1, cosElong))) / DEG2RAD

  // Phase angle i: angle at Moon between Earth and Sun
  // Vector from Moon to Earth: -moonGCRS
@ -104,16 +101,16 @@ export function computeIllumination(
    sunGCRS[2] - moonGCRS[2],
  ]
  const moonToEarth: Vec3 = [-moonGCRS[0], -moonGCRS[1], -moonGCRS[2]]
-  const rMoonToSun = norm(moonToSun)
+  const rMoonToSun = vnorm(moonToSun)

-  const cosPhase = dot(moonToEarth, moonToSun) / (rMoon * rMoonToSun)
-  const phaseAngleDeg = Math.acos(Math.max(-1, Math.min(1, cosPhase))) / DEG
+  const cosPhase = vdot(moonToEarth, moonToSun) / (rMoon * rMoonToSun)
+  const phaseAngleDeg = Math.acos(Math.max(-1, Math.min(1, cosPhase))) / DEG2RAD

-  const illumination = (1 + Math.cos(phaseAngleDeg * DEG)) / 2
+  const illumination = (1 + Math.cos(phaseAngleDeg * DEG2RAD)) / 2

  // Moon is waxing when it is east of the Sun (elongation increasing).
  // Cross product sunGCRS × moonGCRS z-component: positive when Moon is east of Sun.
-  const crossZ = sunGCRS[0]*moonGCRS[1] - sunGCRS[1]*moonGCRS[0]
+  const crossZ = sunGCRS[0] * moonGCRS[1] - sunGCRS[1] * moonGCRS[0]
  const isWaxing = crossZ > 0

  return { illumination, phaseAngleDeg, elongationDeg, isWaxing }
@ -143,16 +140,13 @@ export function computeCrescentWidth(
  moonTopoVec: Vec3,
  ARCL: number,
 ): { W: number; Wprime: number } {
-
-  const rMoon = Math.sqrt(
-    moonTopoVec[0]**2 + moonTopoVec[1]**2 + moonTopoVec[2]**2,
-  )
+  const rMoon = Math.sqrt(moonTopoVec[0] ** 2 + moonTopoVec[1] ** 2 + moonTopoVec[2] ** 2)

  // Topocentric semi-diameter in arc minutes
-  const SDmoon_arcmin = Math.atan(MOON_RADIUS_KM / rMoon) / DEG * 60
+  const SDmoon_arcmin = (Math.atan(MOON_RADIUS_KM / rMoon) / DEG2RAD) * 60

  // Crescent width in arc minutes
-  const ARCL_rad = ARCL * DEG
+  const ARCL_rad = ARCL * DEG2RAD
  const W = SDmoon_arcmin * (1 - Math.cos(ARCL_rad))

  // Wprime ≡ W for both Odeh and Yallop in this formulation
@ -185,30 +179,32 @@ export function getMoonSunApproximate(jdTT: number): {
  // Mean longitude L0 and mean anomaly M (degrees)
  const L0 = 280.46646 + 36000.76983 * T + 0.0003032 * T * T
  const M_sun = 357.52911 + 35999.05029 * T - 0.0001537 * T * T
-  const M_sun_rad = (M_sun % 360) * DEG
+  const M_sun_rad = (M_sun % 360) * DEG2RAD

  const e_sun = 0.016708634 - 0.000042037 * T - 0.0000001267 * T * T

  // Equation of center (degrees)
-  const C = (1.914602 - 0.004817 * T - 0.000014 * T * T) * Math.sin(M_sun_rad)
-    + (0.019993 - 0.000101 * T) * Math.sin(2 * M_sun_rad)
-    + 0.000289 * Math.sin(3 * M_sun_rad)
+  const C =
+    (1.914602 - 0.004817 * T - 0.000014 * T * T) * Math.sin(M_sun_rad) +
+    (0.019993 - 0.000101 * T) * Math.sin(2 * M_sun_rad) +
+    0.000289 * Math.sin(3 * M_sun_rad)

  // True longitude and anomaly
  const sunLonDeg = L0 + C
-  const nu_rad = M_sun_rad + C * DEG
+  const nu_rad = M_sun_rad + C * DEG2RAD

  // Geometric distance in AU
-  const R_AU = 1.000001018 * (1 - e_sun * e_sun) / (1 + e_sun * Math.cos(nu_rad))
+  const R_AU = (1.000001018 * (1 - e_sun * e_sun)) / (1 + e_sun * Math.cos(nu_rad))
  const R_km = R_AU * AU_KM

  // Nutation correction for apparent longitude (simplified)
-  const omega = (125.04 - 1934.136 * T) * DEG
+  const omega = (125.04 - 1934.136 * T) * DEG2RAD
  const sunLonApp = sunLonDeg - 0.00569 - 0.00478 * Math.sin(omega)
-  const sunLon_rad = sunLonApp * DEG
+  const sunLon_rad = sunLonApp * DEG2RAD

  // Mean obliquity of the ecliptic (IAU 1980 approximation, degrees)
-  const eps = (23.439291111 - 0.013004167 * T - 0.0000001638 * T * T + 0.0000005036 * T * T * T) * DEG
+  const eps =
+    (23.439291111 - 0.013004167 * T - 0.0000001638 * T * T + 0.0000005036 * T * T * T) * DEG2RAD

  const sunGCRS: Vec3 = [
    R_km * Math.cos(sunLon_rad),
@ -219,121 +215,151 @@ export function getMoonSunApproximate(jdTT: number): {
  // ── Moon (Meeus Ch. 47) ─────────────────────────────────────────────────────

  // Fundamental arguments (degrees)
-  const Lp = 218.3164477 + 481267.88123421 * T - 0.0015786 * T * T + T * T * T / 538841 - T * T * T * T / 65194000
-  const D  = 297.8501921 + 445267.1114034  * T - 0.0018819 * T * T + T * T * T / 545868 - T * T * T * T / 113065000
-  const M  = 357.5291092 + 35999.0502909   * T - 0.0001536 * T * T + T * T * T / 24490000
-  const Mp = 134.9633964 + 477198.8675055  * T + 0.0087414 * T * T + T * T * T / 69699 - T * T * T * T / 14712000
-  const F  =  93.2720950 + 483202.0175233  * T - 0.0036539 * T * T - T * T * T / 3526000 + T * T * T * T / 863310000
+  const Lp =
+    218.3164477 +
+    481267.88123421 * T -
+    0.0015786 * T * T +
+    (T * T * T) / 538841 -
+    (T * T * T * T) / 65194000
+  const D =
+    297.8501921 +
+    445267.1114034 * T -
+    0.0018819 * T * T +
+    (T * T * T) / 545868 -
+    (T * T * T * T) / 113065000
+  const M = 357.5291092 + 35999.0502909 * T - 0.0001536 * T * T + (T * T * T) / 24490000
+  const Mp =
+    134.9633964 +
+    477198.8675055 * T +
+    0.0087414 * T * T +
+    (T * T * T) / 69699 -
+    (T * T * T * T) / 14712000
+  const F =
+    93.272095 +
+    483202.0175233 * T -
+    0.0036539 * T * T -
+    (T * T * T) / 3526000 +
+    (T * T * T * T) / 863310000

  // Additive terms for longitude/latitude
-  const A1 = (119.75 + 131.849 * T) * DEG
-  const A2 = ( 53.09 + 479264.290 * T) * DEG
-  const A3 = (313.45 + 481266.484 * T) * DEG
+  const A1 = (119.75 + 131.849 * T) * DEG2RAD
+  const A2 = (53.09 + 479264.29 * T) * DEG2RAD
+  const A3 = (313.45 + 481266.484 * T) * DEG2RAD

  // Convert to radians for accumulation
-  const D_r  = (D  % 360) * DEG
-  const M_r  = (M  % 360) * DEG
-  const Mp_r = (Mp % 360) * DEG
-  const F_r  = (F  % 360) * DEG
+  const D_r = (D % 360) * DEG2RAD
+  const M_r = (M % 360) * DEG2RAD
+  const Mp_r = (Mp % 360) * DEG2RAD
+  const F_r = (F % 360) * DEG2RAD

  // Eccentricity correction for terms involving M (Earth's orbital eccentricity)
  const E = 1 - 0.002516 * T - 0.0000074 * T * T

  // Longitude and distance accumulation — 30 main terms from Meeus Table 47.A
  // [d, m, mp, f, Σl (0.000001°), Σr (0.001 km)]
-  const LD: ReadonlyArray<readonly [number,number,number,number,number,number]> = [
-    [ 0, 0, 1, 0,  6288774, -20905355],
-    [ 2, 0,-1, 0,  1274027,  -3699111],
-    [ 2, 0, 0, 0,   658314,  -2955968],
-    [ 0, 0, 2, 0,   213618,   -569925],
-    [ 0, 1, 0, 0,  -185116,     48888],
-    [ 0, 0, 0, 2,  -114332,     -3149],
-    [ 2, 0,-2, 0,    58793,    246158],
-    [ 2,-1,-1, 0,    57066,   -152138],
-    [ 2, 0, 1, 0,    53322,   -170733],
-    [ 2,-1, 0, 0,    45758,   -204586],
-    [ 0, 1,-1, 0,   -40923,   -129620],
-    [ 1, 0, 0, 0,   -34720,    108743],
-    [ 0, 1, 1, 0,   -30383,    104755],
-    [ 2, 0, 0,-2,    15327,     10321],
-    [ 0, 0, 1, 2,   -12528,         0],
-    [ 0, 0, 1,-2,    10980,     79661],
-    [ 4, 0,-1, 0,    10675,    -34782],
-    [ 0, 0, 3, 0,    10034,    -23210],
-    [ 4, 0,-2, 0,     8548,    -21636],
-    [ 2, 1,-1, 0,    -7888,     24208],
-    [ 2, 1, 0, 0,    -6766,     30824],
-    [ 1, 0,-1, 0,    -5163,     -8379],
-    [ 1, 1, 0, 0,     4987,    -16675],
-    [ 2,-1, 1, 0,     4036,    -12831],
-    [ 2, 0, 2, 0,     3994,    -10445],
-    [ 4, 0, 0, 0,     3861,    -11650],
-    [ 2, 0,-3, 0,     3665,     14403],
-    [ 0, 1,-2, 0,    -2689,     -7003],
-    [ 2, 0,-1, 2,    -2602,         0],
-    [ 2,-1,-2, 0,     2390,     10056],
+  const LD: ReadonlyArray<readonly [number, number, number, number, number, number]> = [
+    [0, 0, 1, 0, 6288774, -20905355],
+    [2, 0, -1, 0, 1274027, -3699111],
+    [2, 0, 0, 0, 658314, -2955968],
+    [0, 0, 2, 0, 213618, -569925],
+    [0, 1, 0, 0, -185116, 48888],
+    [0, 0, 0, 2, -114332, -3149],
+    [2, 0, -2, 0, 58793, 246158],
+    [2, -1, -1, 0, 57066, -152138],
+    [2, 0, 1, 0, 53322, -170733],
+    [2, -1, 0, 0, 45758, -204586],
+    [0, 1, -1, 0, -40923, -129620],
+    [1, 0, 0, 0, -34720, 108743],
+    [0, 1, 1, 0, -30383, 104755],
+    [2, 0, 0, -2, 15327, 10321],
+    [0, 0, 1, 2, -12528, 0],
+    [0, 0, 1, -2, 10980, 79661],
+    [4, 0, -1, 0, 10675, -34782],
+    [0, 0, 3, 0, 10034, -23210],
+    [4, 0, -2, 0, 8548, -21636],
+    [2, 1, -1, 0, -7888, 24208],
+    [2, 1, 0, 0, -6766, 30824],
+    [1, 0, -1, 0, -5163, -8379],
+    [1, 1, 0, 0, 4987, -16675],
+    [2, -1, 1, 0, 4036, -12831],
+    [2, 0, 2, 0, 3994, -10445],
+    [4, 0, 0, 0, 3861, -11650],
+    [2, 0, -3, 0, 3665, 14403],
+    [0, 1, -2, 0, -2689, -7003],
+    [2, 0, -1, 2, -2602, 0],
+    [2, -1, -2, 0, 2390, 10056],
  ]

-  let Sl = 0, Sr = 0
+  let Sl = 0,
+    Sr = 0
  for (const [d, m, mp, f, sl, sr] of LD) {
-    const arg = d*D_r + m*M_r + mp*Mp_r + f*F_r
-    const eCorr = Math.abs(m) === 2 ? E*E : Math.abs(m) === 1 ? E : 1
+    const arg = d * D_r + m * M_r + mp * Mp_r + f * F_r
+    const eCorr = Math.abs(m) === 2 ? E * E : Math.abs(m) === 1 ? E : 1
    Sl += sl * eCorr * Math.sin(arg)
    Sr += sr * eCorr * Math.cos(arg)
  }

  // Additive longitude corrections (Meeus §47)
-  Sl += 3958 * Math.sin(A1) + 1962 * Math.sin((Lp - F) * DEG) + 318 * Math.sin(A2)
+  Sl += 3958 * Math.sin(A1) + 1962 * Math.sin((Lp - F) * DEG2RAD) + 318 * Math.sin(A2)

  // Latitude accumulation — 20 main terms from Meeus Table 47.B
  // [d, m, mp, f, Σb (0.000001°)]
-  const FB: ReadonlyArray<readonly [number,number,number,number,number]> = [
-    [ 0, 0, 0, 1,  5128122],
-    [ 0, 0, 1, 1,   280602],
-    [ 0, 0, 1,-1,   277693],
-    [ 2, 0, 0,-1,   173237],
-    [ 2, 0,-1, 1,    55413],
-    [ 2, 0,-1,-1,    46271],
-    [ 2, 0, 0, 1,    32573],
-    [ 0, 0, 2, 1,    17198],
-    [ 2, 0, 1,-1,     9266],
-    [ 0, 0, 2,-1,     8822],
-    [ 2,-1, 0,-1,     8216],
-    [ 2, 0,-2,-1,     4324],
-    [ 2, 0, 1, 1,     4200],
-    [ 2, 1, 0,-1,    -3359],
-    [ 2,-1,-1, 1,     2463],
-    [ 2,-1, 0, 1,     2211],
-    [ 2,-1,-1,-1,     2065],
-    [ 0, 1,-1,-1,    -1870],
-    [ 4, 0,-1,-1,     1828],
-    [ 0, 1, 0, 1,    -1794],
+  const FB: ReadonlyArray<readonly [number, number, number, number, number]> = [
+    [0, 0, 0, 1, 5128122],
+    [0, 0, 1, 1, 280602],
+    [0, 0, 1, -1, 277693],
+    [2, 0, 0, -1, 173237],
+    [2, 0, -1, 1, 55413],
+    [2, 0, -1, -1, 46271],
+    [2, 0, 0, 1, 32573],
+    [0, 0, 2, 1, 17198],
+    [2, 0, 1, -1, 9266],
+    [0, 0, 2, -1, 8822],
+    [2, -1, 0, -1, 8216],
+    [2, 0, -2, -1, 4324],
+    [2, 0, 1, 1, 4200],
+    [2, 1, 0, -1, -3359],
+    [2, -1, -1, 1, 2463],
+    [2, -1, 0, 1, 2211],
+    [2, -1, -1, -1, 2065],
+    [0, 1, -1, -1, -1870],
+    [4, 0, -1, -1, 1828],
+    [0, 1, 0, 1, -1794],
  ]

  let Sb = 0
  for (const [d, m, mp, f, sb] of FB) {
-    const arg = d*D_r + m*M_r + mp*Mp_r + f*F_r
-    const eCorr = Math.abs(m) === 2 ? E*E : Math.abs(m) === 1 ? E : 1
+    const arg = d * D_r + m * M_r + mp * Mp_r + f * F_r
+    const eCorr = Math.abs(m) === 2 ? E * E : Math.abs(m) === 1 ? E : 1
    Sb += sb * eCorr * Math.sin(arg)
  }

  // Additive latitude corrections
-  Sb += -2235 * Math.sin(Lp * DEG) + 382 * Math.sin(A3) + 175 * Math.sin(A1 - F_r)
-      + 175 * Math.sin(A1 + F_r) + 127 * Math.sin((Lp - Mp) * DEG) - 115 * Math.sin((Lp + Mp) * DEG)
+  Sb +=
+    -2235 * Math.sin(Lp * DEG2RAD) +
+    382 * Math.sin(A3) +
+    175 * Math.sin(A1 - F_r) +
+    175 * Math.sin(A1 + F_r) +
+    127 * Math.sin((Lp - Mp) * DEG2RAD) -
+    115 * Math.sin((Lp + Mp) * DEG2RAD)

  // Moon ecliptic coordinates
  const moonLonDeg = Lp + Sl * 1e-6
  const moonLatDeg = Sb * 1e-6
  const moonDistKm = 385000.56 + Sr * 0.001

-  const moonLon_rad = moonLonDeg * DEG
-  const moonLat_rad = moonLatDeg * DEG
+  const moonLon_rad = moonLonDeg * DEG2RAD
+  const moonLat_rad = moonLatDeg * DEG2RAD

  // Ecliptic to equatorial (GCRS ≈ J2000 equatorial for this accuracy level)
  const moonGCRS: Vec3 = [
    moonDistKm * Math.cos(moonLat_rad) * Math.cos(moonLon_rad),
-    moonDistKm * (Math.cos(eps) * Math.cos(moonLat_rad) * Math.sin(moonLon_rad) - Math.sin(eps) * Math.sin(moonLat_rad)),
-    moonDistKm * (Math.sin(eps) * Math.cos(moonLat_rad) * Math.sin(moonLon_rad) + Math.cos(eps) * Math.sin(moonLat_rad)),
+    moonDistKm *
+      (Math.cos(eps) * Math.cos(moonLat_rad) * Math.sin(moonLon_rad) -
+        Math.sin(eps) * Math.sin(moonLat_rad)),
+    moonDistKm *
+      (Math.sin(eps) * Math.cos(moonLat_rad) * Math.sin(moonLon_rad) +
+        Math.cos(eps) * Math.sin(moonLat_rad)),
  ]

  return { moonGCRS, sunGCRS }
@ -355,48 +381,49 @@ export function nearestNewMoon(jdTT: number): number {
  const T = k / 1236.85

  // JDE of mean new moon (Meeus Eq. 49.1)
-  let JDE = 2451550.09766
-    + 29.530588861 * k
-    + 0.00015437 * T * T
-    - 0.000000150 * T * T * T
-    + 0.00000000073 * T * T * T * T
+  let JDE =
+    2451550.09766 +
+    29.530588861 * k +
+    0.00015437 * T * T -
+    0.00000015 * T * T * T +
+    0.00000000073 * T * T * T * T

  // Fundamental arguments for the corrections (degrees → radians)
-  const M  = (2.5534 + 29.10535670 * k - 0.0000014 * T * T - 0.00000011 * T * T * T) * DEG
-  const Mp = (201.5643 + 385.81693528 * k + 0.0107582 * T * T + 0.00001238 * T * T * T) * DEG
-  const Fc = (160.7108 + 390.67050284 * k - 0.0016118 * T * T - 0.00000227 * T * T * T) * DEG
-  const Om = (124.7746 - 1.56375588 * k + 0.0020672 * T * T + 0.00000215 * T * T * T) * DEG
+  const M = (2.5534 + 29.1053567 * k - 0.0000014 * T * T - 0.00000011 * T * T * T) * DEG2RAD
+  const Mp = (201.5643 + 385.81693528 * k + 0.0107582 * T * T + 0.00001238 * T * T * T) * DEG2RAD
+  const Fc = (160.7108 + 390.67050284 * k - 0.0016118 * T * T - 0.00000227 * T * T * T) * DEG2RAD
+  const Om = (124.7746 - 1.56375588 * k + 0.0020672 * T * T + 0.00000215 * T * T * T) * DEG2RAD

  // Eccentricity of Earth's orbit
  const E = 1 - 0.002516 * T - 0.0000074 * T * T

  // Corrections from Meeus Table 49.A (new moon)
  JDE +=
-    -0.40720 * Math.sin(Mp)
-    + 0.17241 * E * Math.sin(M)
-    + 0.01608 * Math.sin(2 * Mp)
-    + 0.01039 * Math.sin(2 * Fc)
-    + 0.00739 * E * Math.sin(Mp - M)
-    - 0.00514 * E * Math.sin(Mp + M)
-    + 0.00208 * E * E * Math.sin(2 * M)
-    - 0.00111 * Math.sin(Mp - 2 * Fc)
-    - 0.00057 * Math.sin(Mp + 2 * Fc)
-    + 0.00056 * E * Math.sin(2 * Mp + M)
-    - 0.00042 * Math.sin(3 * Mp)
-    + 0.00042 * E * Math.sin(M + 2 * Fc)
-    + 0.00038 * E * Math.sin(M - 2 * Fc)
-    - 0.00024 * E * Math.sin(2 * Mp - M)
-    - 0.00017 * Math.sin(Om)
-    - 0.00007 * Math.sin(Mp + 2 * M)
-    + 0.00004 * Math.sin(2 * Mp - 2 * Fc)
-    + 0.00004 * Math.sin(3 * M)
-    + 0.00003 * Math.sin(Mp + M - 2 * Fc)
-    + 0.00003 * Math.sin(2 * Mp + 2 * Fc)
-    - 0.00003 * Math.sin(Mp + M + 2 * Fc)
-    + 0.00003 * Math.sin(Mp - M + 2 * Fc)
-    - 0.00002 * Math.sin(Mp - M - 2 * Fc)
-    - 0.00002 * Math.sin(3 * Mp + M)
-    + 0.00002 * Math.sin(4 * Mp)
+    -0.4072 * Math.sin(Mp) +
+    0.17241 * E * Math.sin(M) +
+    0.01608 * Math.sin(2 * Mp) +
+    0.01039 * Math.sin(2 * Fc) +
+    0.00739 * E * Math.sin(Mp - M) -
+    0.00514 * E * Math.sin(Mp + M) +
+    0.00208 * E * E * Math.sin(2 * M) -
+    0.00111 * Math.sin(Mp - 2 * Fc) -
+    0.00057 * Math.sin(Mp + 2 * Fc) +
+    0.00056 * E * Math.sin(2 * Mp + M) -
+    0.00042 * Math.sin(3 * Mp) +
+    0.00042 * E * Math.sin(M + 2 * Fc) +
+    0.00038 * E * Math.sin(M - 2 * Fc) -
+    0.00024 * E * Math.sin(2 * Mp - M) -
+    0.00017 * Math.sin(Om) -
+    0.00007 * Math.sin(Mp + 2 * M) +
+    0.00004 * Math.sin(2 * Mp - 2 * Fc) +
+    0.00004 * Math.sin(3 * M) +
+    0.00003 * Math.sin(Mp + M - 2 * Fc) +
+    0.00003 * Math.sin(2 * Mp + 2 * Fc) -
+    0.00003 * Math.sin(Mp + M + 2 * Fc) +
+    0.00003 * Math.sin(Mp - M + 2 * Fc) -
+    0.00002 * Math.sin(Mp - M - 2 * Fc) -
+    0.00002 * Math.sin(3 * Mp + M) +
+    0.00002 * Math.sin(4 * Mp)

  return JDE
 }
--- a/src/cli/index.ts
+++ b/src/cli/index.ts
@ -100,7 +100,9 @@ async function cmdSighting(cmdArgs: string[]) {
  console.log(`Sunset:    ${fmtDate(report.sunsetUTC)}`)
  console.log(`Moonset:   ${fmtDate(report.moonsetUTC)}`)
  console.log(`Best time: ${fmtDate(report.bestTimeUTC)}`)
-  console.log(`Lag:       ${report.lagMinutes !== null ? Math.round(report.lagMinutes) + ' min' : 'N/A'}`)
+  console.log(
+    `Lag:       ${report.lagMinutes !== null ? Math.round(report.lagMinutes) + ' min' : 'N/A'}`,
+  )
  console.log('')

  if (report.geometry) {
@ -151,7 +153,9 @@ async function cmdBenchmark() {
    getMoonPhase(new Date(Date.UTC(2025, 2, 1 + (i % 28))))
  }
  const phaseMs = performance.now() - phaseStart
-  console.log(`getMoonPhase × ${N_PHASE}: ${phaseMs.toFixed(1)} ms  (${(phaseMs / N_PHASE * 1000).toFixed(1)} µs/call)`)
+  console.log(
+    `getMoonPhase × ${N_PHASE}: ${phaseMs.toFixed(1)} ms  (${((phaseMs / N_PHASE) * 1000).toFixed(1)} µs/call)`,
+  )

  // Benchmark 2: kernel load
  const loadStart = performance.now()
@ -170,10 +174,13 @@ async function cmdBenchmark() {
 /** Format a nullable Date as a short UTC string. */
 function fmtDate(d: Date | null): string {
  if (!d) return 'N/A'
-  return d.toISOString().replace('T', ' ').replace(/\.\d+Z$/, ' UTC')
+  return d
+    .toISOString()
+    .replace('T', ' ')
+    .replace(/\.\d+Z$/, ' UTC')
 }

-main().catch(err => {
+main().catch((err) => {
  console.error(err instanceof Error ? err.message : String(err))
  process.exit(1)
 })
--- a/src/events/index.ts
+++ b/src/events/index.ts
@ -22,7 +22,8 @@
 import type { Vec3, Observer, SunMoonEvents, TimeScales } from '../types.js'
 import type { SpkKernel } from '../spk/index.js'
 import { NAIF_IDS } from '../spk/index.js'
-import { brentRoot } from '../math/index.js'
+import { brentRoot, vdot, vnorm } from '../math/index.js'
+import { arcvMinimum } from '../visibility/index.js'
 import {
  J2000,
  SECONDS_PER_DAY,
@ -33,7 +34,11 @@ import {
  getDeltaAT,
  TT_MINUS_TAI,
 } from '../time/index.js'
-import { getMoonGeocentricState, getSunGeocentricState, computeCrescentWidth } from '../bodies/index.js'
+import {
+  getMoonGeocentricState,
+  getSunGeocentricState,
+  computeCrescentWidth,
+} from '../bodies/index.js'
 import { geodeticToECEF, computeAzAlt } from '../observer/index.js'
 import { itrsToGcrs } from '../frames/index.js'

@ -51,7 +56,7 @@ export const SUN_ALTITUDE_THRESHOLD = -0.8333
 * Accounts for: standard refraction at horizon (34') + lunar semi-diameter (~16')
 * Note: Moon's SD varies with distance (14.7'–16.8'). Use 0.2725° as mean.
 */
-export const MOON_ALTITUDE_THRESHOLD = -0.8333  // refined per actual distance in implementation
+export const MOON_ALTITUDE_THRESHOLD = -0.8333 // refined per actual distance in implementation

 // ─── Internal helpers ─────────────────────────────────────────────────────────

@ -130,7 +135,7 @@ export function findAltitudeCrossing(

  const f = (et: number) => altitudeMinusThreshold(kernel, naifId, observer, et, threshold)

-  const STEP_S = 600  // 10-minute coarse sampling
+  const STEP_S = 600 // 10-minute coarse sampling
  const nSteps = Math.ceil((endET - startET) / STEP_S)

  let prevET = startET
@ -140,11 +145,11 @@ export function findAltitudeCrossing(
    const currET = Math.min(startET + i * STEP_S, endET)
    const currF = f(currET)

-    const isRisingCross  = rising  && prevF < 0 && currF >= 0
+    const isRisingCross = rising && prevF < 0 && currF >= 0
    const isSettingCross = !rising && prevF >= 0 && currF < 0

    if (isRisingCross || isSettingCross) {
-      const etCross = brentRoot(f, prevET, currET, 0.5)  // 0.5s precision
+      const etCross = brentRoot(f, prevET, currET, 0.5) // 0.5s precision
      if (etCross !== null) {
        const tsCross = etToTS(etCross)
        return tsCross.utc
@ -169,45 +174,90 @@ export function findAltitudeCrossing(
 * @param kernel - DE442S kernel
 * @returns SunMoonEvents with all event times in UTC, or null if event doesn't occur
 */
-export function getSunMoonEvents(
-  date: Date,
-  observer: Observer,
-  kernel: SpkKernel,
-): SunMoonEvents {
+export function getSunMoonEvents(date: Date, observer: Observer, kernel: SpkKernel): SunMoonEvents {
  // Anchor search at UTC midnight of the input date
  const midnight = new Date(Date.UTC(date.getUTCFullYear(), date.getUTCMonth(), date.getUTCDate()))
  const jdMidnight = dateToJD(midnight)
  // Approximate ET at midnight
-  const etStart = jdTTtoET(jdMidnight + 70.0 / SECONDS_PER_DAY)  // rough TT≈UTC+70s
-  const etEnd   = etStart + 28 * 3600  // 28-hour window
+  const etStart = jdTTtoET(jdMidnight + 70.0 / SECONDS_PER_DAY) // rough TT≈UTC+70s
+  const etEnd = etStart + 28 * 3600 // 28-hour window

  const ts0 = computeTimeScales(midnight)

  // Sun events
  const sunriseUTC = findAltitudeCrossing(
-    kernel, NAIF_IDS.SUN, observer, ts0, etStart, etEnd, SUN_ALTITUDE_THRESHOLD, true,
+    kernel,
+    NAIF_IDS.SUN,
+    observer,
+    ts0,
+    etStart,
+    etEnd,
+    SUN_ALTITUDE_THRESHOLD,
+    true,
  )
  const sunsetUTC = findAltitudeCrossing(
-    kernel, NAIF_IDS.SUN, observer, ts0, etStart, etEnd, SUN_ALTITUDE_THRESHOLD, false,
+    kernel,
+    NAIF_IDS.SUN,
+    observer,
+    ts0,
+    etStart,
+    etEnd,
+    SUN_ALTITUDE_THRESHOLD,
+    false,
  )

  // Twilight events (Sun setting below -6°, -12°, -18°)
  const civilTwilightEndUTC = findAltitudeCrossing(
-    kernel, NAIF_IDS.SUN, observer, ts0, etStart, etEnd, -6, false,
+    kernel,
+    NAIF_IDS.SUN,
+    observer,
+    ts0,
+    etStart,
+    etEnd,
+    -6,
+    false,
  )
  const nauticalTwilightEndUTC = findAltitudeCrossing(
-    kernel, NAIF_IDS.SUN, observer, ts0, etStart, etEnd, -12, false,
+    kernel,
+    NAIF_IDS.SUN,
+    observer,
+    ts0,
+    etStart,
+    etEnd,
+    -12,
+    false,
  )
  const astronomicalTwilightEndUTC = findAltitudeCrossing(
-    kernel, NAIF_IDS.SUN, observer, ts0, etStart, etEnd, -18, false,
+    kernel,
+    NAIF_IDS.SUN,
+    observer,
+    ts0,
+    etStart,
+    etEnd,
+    -18,
+    false,
  )

  // Moon events
  const moonriseUTC = findAltitudeCrossing(
-    kernel, NAIF_IDS.MOON, observer, ts0, etStart, etEnd, MOON_ALTITUDE_THRESHOLD, true,
+    kernel,
+    NAIF_IDS.MOON,
+    observer,
+    ts0,
+    etStart,
+    etEnd,
+    MOON_ALTITUDE_THRESHOLD,
+    true,
  )
  const moonsetUTC = findAltitudeCrossing(
-    kernel, NAIF_IDS.MOON, observer, ts0, etStart, etEnd, MOON_ALTITUDE_THRESHOLD, false,
+    kernel,
+    NAIF_IDS.MOON,
+    observer,
+    ts0,
+    etStart,
+    etEnd,
+    MOON_ALTITUDE_THRESHOLD,
+    false,
  )

  return {
@ -241,7 +291,7 @@ export function bestTimeHeuristic(
  moonsetUTC: Date,
 ): { bestTimeUTC: Date; lagMinutes: number } | null {
  const lagMs = moonsetUTC.getTime() - sunsetUTC.getTime()
-  if (lagMs <= 0) return null  // Moon sets before Sun — no sighting possible
+  if (lagMs <= 0) return null // Moon sets before Sun — no sighting possible

  const lagMinutes = lagMs / 60000
  const bestTimeMs = sunsetUTC.getTime() + (4 / 9) * lagMs
@ -252,14 +302,6 @@ export function bestTimeHeuristic(
  }
 }

-/**
- * Odeh arcv minimum polynomial (Odeh 2006, Eq. 1).
- * Returns the minimum ARCV needed for visibility at crescent width W (arc minutes).
- */
-function odehArcvMin(W: number): number {
-  return 11.8371 - 6.3226 * W + 0.7319 * W * W - 0.1018 * W * W * W
-}
-
 /**
 * Find the optimal observation time by maximizing the Odeh V parameter
 * over the interval [sunset, moonset].
@ -290,9 +332,6 @@ export function bestTimeOptimized(
  const obsECEF = geodeticToECEF(observer.lat, observer.lon, observer.elevation)
  const obsITRS: Vec3 = [obsECEF[0] / 1000, obsECEF[1] / 1000, obsECEF[2] / 1000]

-  const dot = (a: Vec3, b: Vec3) => a[0]*b[0] + a[1]*b[1] + a[2]*b[2]
-  const norm = (v: Vec3) => Math.sqrt(dot(v, v))
-
  let bestTimeUTC = sunsetUTC
  let maxV = -Infinity

@ -302,14 +341,14 @@ export function bestTimeOptimized(
    const et = jdTTtoET(ts.jdTT)

    const moonGCRS = getMoonGeocentricState(kernel, et).position
-    const sunGCRS  = getSunGeocentricState(kernel, et).position
+    const sunGCRS = getSunGeocentricState(kernel, et).position

    // Convert observer ITRS → GCRS at this timestep (Earth rotation changes per step)
    const obsGCRS = itrsToGcrs(obsITRS, ts)

    // Airless altitudes via the full pipeline
    const moonAzAlt = computeAzAlt(moonGCRS, observer, ts, true)
-    const sunAzAlt  = computeAzAlt(sunGCRS,  observer, ts, true)
+    const sunAzAlt = computeAzAlt(sunGCRS, observer, ts, true)

    const ARCV = moonAzAlt.altitude - sunAzAlt.altitude

@ -324,11 +363,11 @@ export function bestTimeOptimized(
      sunGCRS[1] - obsGCRS[1],
      sunGCRS[2] - obsGCRS[2],
    ]
-    const cosARCL = dot(moonTopo, sunTopo) / (norm(moonTopo) * norm(sunTopo))
+    const cosARCL = vdot(moonTopo, sunTopo) / (vnorm(moonTopo) * vnorm(sunTopo))
    const ARCL = Math.acos(Math.max(-1, Math.min(1, cosARCL))) * (180 / Math.PI)

    const { W } = computeCrescentWidth(moonTopo, ARCL)
-    const V = ARCV - odehArcvMin(W)
+    const V = ARCV - arcvMinimum(W)

    if (V > maxV) {
      maxV = V
@ -347,13 +386,7 @@ export function bestTimeOptimized(
 * @param windowMinutes - Half-width of window in minutes (default 20)
 * @returns [start, end] UTC Date pair
 */
-export function computeObservationWindow(
-  bestTimeUTC: Date,
-  windowMinutes = 20,
-): [Date, Date] {
+export function computeObservationWindow(bestTimeUTC: Date, windowMinutes = 20): [Date, Date] {
  const windowMs = windowMinutes * 60000
-  return [
-    new Date(bestTimeUTC.getTime() - windowMs),
-    new Date(bestTimeUTC.getTime() + windowMs),
-  ]
+  return [new Date(bestTimeUTC.getTime() - windowMs), new Date(bestTimeUTC.getTime() + windowMs)]
 }
--- a/src/frames/index.ts
+++ b/src/frames/index.ts
@ -50,165 +50,163 @@ const UAS01_TO_ARCSEC = 1e-7
 //   dpsi += (ps + pst*T)*sin(arg) + pc*cos(arg)
 //   deps += (ec + ect*T)*cos(arg) + es*sin(arg)

-const NUT_2000B: ReadonlyArray<readonly [
-  number,number,number,number,number,
-  number,number,number,
-  number,number,number
-]> = [
+const NUT_2000B: ReadonlyArray<
+  readonly [number, number, number, number, number, number, number, number, number, number, number]
+> = [
  // 1
-  [ 0, 0, 0, 0, 1, -172064161.0, -174666.0, 33386.0, 92052331.0, 9086.0, 15377.0],
+  [0, 0, 0, 0, 1, -172064161.0, -174666.0, 33386.0, 92052331.0, 9086.0, 15377.0],
  // 2
-  [ 0, 0, 2,-2, 2, -13170906.0, -13696.0, -13238.0, 5730336.0, -3015.0, -4587.0],
+  [0, 0, 2, -2, 2, -13170906.0, -13696.0, -13238.0, 5730336.0, -3015.0, -4587.0],
  // 3
-  [ 0, 0, 2, 0, 2,  -2276413.0,  -2353.0,   2796.0,  978459.0,  -619.0,   645.0],
+  [0, 0, 2, 0, 2, -2276413.0, -2353.0, 2796.0, 978459.0, -619.0, 645.0],
  // 4
-  [ 0, 0, 0, 0, 2,   2074554.0,   2352.0,  -2635.0, -897492.0,   307.0,  -187.0],
+  [0, 0, 0, 0, 2, 2074554.0, 2352.0, -2635.0, -897492.0, 307.0, -187.0],
  // 5
-  [ 0, 1, 0, 0, 0,   1475877.0, -11817.0,  11817.0,   73871.0,  -184.0, -1924.0],
+  [0, 1, 0, 0, 0, 1475877.0, -11817.0, 11817.0, 73871.0, -184.0, -1924.0],
  // 6
-  [ 0, 1, 2,-2, 2,   -516821.0,   1226.0,   -524.0,  224386.0,  -677.0,  -174.0],
+  [0, 1, 2, -2, 2, -516821.0, 1226.0, -524.0, 224386.0, -677.0, -174.0],
  // 7
-  [ 1, 0, 0, 0, 0,    711159.0,     73.0,   -872.0,   -6750.0,     0.0,   358.0],
+  [1, 0, 0, 0, 0, 711159.0, 73.0, -872.0, -6750.0, 0.0, 358.0],
  // 8
-  [ 0, 0, 2, 0, 1,   -387298.0,   -367.0,    380.0,  200728.0,    18.0,   318.0],
+  [0, 0, 2, 0, 1, -387298.0, -367.0, 380.0, 200728.0, 18.0, 318.0],
  // 9
-  [ 1, 0, 2, 0, 2,   -301461.0,    -36.0,    816.0,  129025.0,   -63.0,   367.0],
+  [1, 0, 2, 0, 2, -301461.0, -36.0, 816.0, 129025.0, -63.0, 367.0],
  // 10
-  [ 0,-1, 2,-2, 2,    215829.0,   -494.0,    111.0,  -95929.0,   299.0,   132.0],
+  [0, -1, 2, -2, 2, 215829.0, -494.0, 111.0, -95929.0, 299.0, 132.0],
  // 11
-  [ 0, 0, 2,-2, 1,    128227.0,    137.0,    181.0,  -68982.0,    -9.0,    39.0],
+  [0, 0, 2, -2, 1, 128227.0, 137.0, 181.0, -68982.0, -9.0, 39.0],
  // 12
-  [-1, 0, 2, 0, 2,    123457.0,     11.0,     19.0,  -53311.0,    32.0,    -4.0],
+  [-1, 0, 2, 0, 2, 123457.0, 11.0, 19.0, -53311.0, 32.0, -4.0],
  // 13
-  [-1, 0, 0, 2, 0,    156994.0,     10.0,   -168.0,   -1235.0,     0.0,    82.0],
+  [-1, 0, 0, 2, 0, 156994.0, 10.0, -168.0, -1235.0, 0.0, 82.0],
  // 14
-  [ 1, 0, 0, 0, 1,     63110.0,     63.0,     27.0,  -33228.0,     0.0,    -9.0],
+  [1, 0, 0, 0, 1, 63110.0, 63.0, 27.0, -33228.0, 0.0, -9.0],
  // 15
-  [-1, 0, 0, 0, 1,    -57976.0,    -63.0,   -189.0,   31429.0,     0.0,   -75.0],
+  [-1, 0, 0, 0, 1, -57976.0, -63.0, -189.0, 31429.0, 0.0, -75.0],
  // 16
-  [-1, 0, 2, 2, 2,    -59641.0,    -11.0,    149.0,   25543.0,   -11.0,    66.0],
+  [-1, 0, 2, 2, 2, -59641.0, -11.0, 149.0, 25543.0, -11.0, 66.0],
  // 17
-  [ 1, 0, 2, 0, 1,    -51613.0,    -42.0,    129.0,   26366.0,     0.0,    78.0],
+  [1, 0, 2, 0, 1, -51613.0, -42.0, 129.0, 26366.0, 0.0, 78.0],
  // 18
-  [-2, 0, 2, 0, 1,     45893.0,     50.0,     31.0,  -24236.0,   -10.0,    20.0],
+  [-2, 0, 2, 0, 1, 45893.0, 50.0, 31.0, -24236.0, -10.0, 20.0],
  // 19
-  [ 0, 0, 0, 2, 0,     63384.0,     11.0,   -150.0,   -1220.0,     0.0,    29.0],
+  [0, 0, 0, 2, 0, 63384.0, 11.0, -150.0, -1220.0, 0.0, 29.0],
  // 20
-  [ 0, 0, 2, 2, 2,    -38571.0,     -1.0,    158.0,   16452.0,   -11.0,    68.0],
+  [0, 0, 2, 2, 2, -38571.0, -1.0, 158.0, 16452.0, -11.0, 68.0],
  // 21
-  [ 0,-2, 2,-2, 2,     32481.0,      0.0,      0.0,  -13870.0,     0.0,     0.0],
+  [0, -2, 2, -2, 2, 32481.0, 0.0, 0.0, -13870.0, 0.0, 0.0],
  // 22
-  [-2, 0, 0, 2, 0,    -47722.0,      0.0,    -18.0,     477.0,     0.0,   -25.0],
+  [-2, 0, 0, 2, 0, -47722.0, 0.0, -18.0, 477.0, 0.0, -25.0],
  // 23
-  [ 2, 0, 2, 0, 2,    -31046.0,     -1.0,    131.0,   13238.0,   -11.0,    59.0],
+  [2, 0, 2, 0, 2, -31046.0, -1.0, 131.0, 13238.0, -11.0, 59.0],
  // 24
-  [ 1, 0, 2,-2, 2,     28593.0,      0.0,     -1.0,  -12338.0,    10.0,    -3.0],
+  [1, 0, 2, -2, 2, 28593.0, 0.0, -1.0, -12338.0, 10.0, -3.0],
  // 25
-  [-1, 0, 2, 0, 1,     20441.0,     21.0,     10.0,  -10758.0,     0.0,    -3.0],
+  [-1, 0, 2, 0, 1, 20441.0, 21.0, 10.0, -10758.0, 0.0, -3.0],
  // 26
-  [ 2, 0, 0, 0, 0,     29243.0,      0.0,    -74.0,    -609.0,     0.0,    13.0],
+  [2, 0, 0, 0, 0, 29243.0, 0.0, -74.0, -609.0, 0.0, 13.0],
  // 27
-  [ 0, 0, 2, 0, 0,     25887.0,      0.0,    -66.0,    -550.0,     0.0,    11.0],
+  [0, 0, 2, 0, 0, 25887.0, 0.0, -66.0, -550.0, 0.0, 11.0],
  // 28
-  [ 0, 1, 0, 0, 1,    -14053.0,    -25.0,     79.0,    8551.0,    -2.0,   -45.0],
+  [0, 1, 0, 0, 1, -14053.0, -25.0, 79.0, 8551.0, -2.0, -45.0],
  // 29
-  [-1, 0, 0, 2, 1,     15164.0,     10.0,     11.0,   -8001.0,     0.0,    -1.0],
+  [-1, 0, 0, 2, 1, 15164.0, 10.0, 11.0, -8001.0, 0.0, -1.0],
  // 30
-  [ 0, 2, 2,-2, 2,    -15794.0,     72.0,    -16.0,    6850.0,   -42.0,    -5.0],
+  [0, 2, 2, -2, 2, -15794.0, 72.0, -16.0, 6850.0, -42.0, -5.0],
  // 31
-  [ 0, 0,-2, 2, 0,     21783.0,      0.0,     13.0,    -167.0,     0.0,    13.0],
+  [0, 0, -2, 2, 0, 21783.0, 0.0, 13.0, -167.0, 0.0, 13.0],
  // 32
-  [ 1, 0, 0,-2, 1,    -12873.0,    -10.0,    -37.0,    6953.0,     0.0,   -14.0],
+  [1, 0, 0, -2, 1, -12873.0, -10.0, -37.0, 6953.0, 0.0, -14.0],
  // 33
-  [ 0,-1, 0, 0, 1,    -12654.0,     11.0,     63.0,    6415.0,     0.0,    26.0],
+  [0, -1, 0, 0, 1, -12654.0, 11.0, 63.0, 6415.0, 0.0, 26.0],
  // 34
-  [-1, 0, 2, 2, 1,    -10204.0,      0.0,     25.0,    5222.0,     0.0,    15.0],
+  [-1, 0, 2, 2, 1, -10204.0, 0.0, 25.0, 5222.0, 0.0, 15.0],
  // 35
-  [ 0, 2, 0, 0, 0,     16707.0,    -85.0,    -10.0,     168.0,    -1.0,    10.0],
+  [0, 2, 0, 0, 0, 16707.0, -85.0, -10.0, 168.0, -1.0, 10.0],
  // 36
-  [ 1, 0, 2, 2, 2,     -7691.0,      0.0,     44.0,    3268.0,     0.0,    19.0],
+  [1, 0, 2, 2, 2, -7691.0, 0.0, 44.0, 3268.0, 0.0, 19.0],
  // 37
-  [-2, 0, 2, 0, 0,    -11024.0,      0.0,    -14.0,     104.0,     0.0,     2.0],
+  [-2, 0, 2, 0, 0, -11024.0, 0.0, -14.0, 104.0, 0.0, 2.0],
  // 38
-  [ 0, 1, 2, 0, 2,      7566.0,    -21.0,    -11.0,   -3250.0,     0.0,    -5.0],
+  [0, 1, 2, 0, 2, 7566.0, -21.0, -11.0, -3250.0, 0.0, -5.0],
  // 39
-  [ 0, 0, 2, 2, 1,     -6637.0,    -11.0,     25.0,    3353.0,     0.0,    14.0],
+  [0, 0, 2, 2, 1, -6637.0, -11.0, 25.0, 3353.0, 0.0, 14.0],
  // 40
-  [ 0,-1, 2, 0, 2,     -7141.0,     21.0,      8.0,    3070.0,     0.0,     4.0],
+  [0, -1, 2, 0, 2, -7141.0, 21.0, 8.0, 3070.0, 0.0, 4.0],
  // 41
-  [ 0, 0, 0, 2, 1,     -6302.0,    -11.0,      2.0,    3272.0,     0.0,     4.0],
+  [0, 0, 0, 2, 1, -6302.0, -11.0, 2.0, 3272.0, 0.0, 4.0],
  // 42
-  [ 1, 0, 2,-2, 1,      5800.0,     10.0,      2.0,   -3045.0,     0.0,    -1.0],
+  [1, 0, 2, -2, 1, 5800.0, 10.0, 2.0, -3045.0, 0.0, -1.0],
  // 43
-  [ 2, 0, 2,-2, 2,      6443.0,      0.0,     -7.0,   -2768.0,     0.0,    -4.0],
+  [2, 0, 2, -2, 2, 6443.0, 0.0, -7.0, -2768.0, 0.0, -4.0],
  // 44
-  [-2, 0, 0, 2, 1,     -5774.0,    -11.0,    -15.0,    3041.0,     0.0,    -5.0],
+  [-2, 0, 0, 2, 1, -5774.0, -11.0, -15.0, 3041.0, 0.0, -5.0],
  // 45
-  [ 2, 0, 2, 0, 1,     -5350.0,      0.0,     21.0,    2695.0,     0.0,    12.0],
+  [2, 0, 2, 0, 1, -5350.0, 0.0, 21.0, 2695.0, 0.0, 12.0],
  // 46
-  [ 0,-1, 2,-2, 1,     -4752.0,    -11.0,     -3.0,    2719.0,     0.0,    -3.0],
+  [0, -1, 2, -2, 1, -4752.0, -11.0, -3.0, 2719.0, 0.0, -3.0],
  // 47
-  [ 0, 0, 0,-2, 1,     -4940.0,    -11.0,    -21.0,    2720.0,     0.0,    -9.0],
+  [0, 0, 0, -2, 1, -4940.0, -11.0, -21.0, 2720.0, 0.0, -9.0],
  // 48
-  [-1,-1, 0, 2, 0,      7350.0,      0.0,     -8.0,     -51.0,     0.0,     4.0],
+  [-1, -1, 0, 2, 0, 7350.0, 0.0, -8.0, -51.0, 0.0, 4.0],
  // 49
-  [ 2, 0, 0,-2, 1,      4065.0,      0.0,      6.0,   -2206.0,     0.0,     1.0],
+  [2, 0, 0, -2, 1, 4065.0, 0.0, 6.0, -2206.0, 0.0, 1.0],
  // 50
-  [ 1, 0, 0, 2, 0,      6579.0,      0.0,    -24.0,    -199.0,     0.0,     2.0],
+  [1, 0, 0, 2, 0, 6579.0, 0.0, -24.0, -199.0, 0.0, 2.0],
  // 51
-  [ 0, 1, 2,-2, 1,      3579.0,      0.0,      5.0,   -1900.0,     0.0,     1.0],
+  [0, 1, 2, -2, 1, 3579.0, 0.0, 5.0, -1900.0, 0.0, 1.0],
  // 52
-  [ 1,-1, 0, 0, 0,      4725.0,      0.0,     -6.0,     -41.0,     0.0,     3.0],
+  [1, -1, 0, 0, 0, 4725.0, 0.0, -6.0, -41.0, 0.0, 3.0],
  // 53
-  [-2, 0, 2, 0, 2,     -3075.0,      0.0,     -2.0,    1313.0,     0.0,    -1.0],
+  [-2, 0, 2, 0, 2, -3075.0, 0.0, -2.0, 1313.0, 0.0, -1.0],
  // 54
-  [ 3, 0, 2, 0, 2,     -2904.0,      0.0,     15.0,    1233.0,     0.0,     7.0],
+  [3, 0, 2, 0, 2, -2904.0, 0.0, 15.0, 1233.0, 0.0, 7.0],
  // 55
-  [ 0,-1, 0, 2, 0,      4348.0,      0.0,    -10.0,     -81.0,     0.0,     2.0],
+  [0, -1, 0, 2, 0, 4348.0, 0.0, -10.0, -81.0, 0.0, 2.0],
  // 56
-  [ 1,-1, 2, 0, 2,     -2878.0,      0.0,      8.0,    1232.0,     0.0,     4.0],
+  [1, -1, 2, 0, 2, -2878.0, 0.0, 8.0, 1232.0, 0.0, 4.0],
  // 57
-  [ 0, 0, 0, 1, 0,     -4230.0,      0.0,      5.0,     -20.0,     0.0,    -2.0],
+  [0, 0, 0, 1, 0, -4230.0, 0.0, 5.0, -20.0, 0.0, -2.0],
  // 58
-  [-1,-1, 2, 2, 2,     -2819.0,      0.0,      7.0,    1207.0,     0.0,     3.0],
+  [-1, -1, 2, 2, 2, -2819.0, 0.0, 7.0, 1207.0, 0.0, 3.0],
  // 59
-  [-1, 0, 2, 0, 0,     -4056.0,      0.0,      5.0,      40.0,     0.0,    -2.0],
+  [-1, 0, 2, 0, 0, -4056.0, 0.0, 5.0, 40.0, 0.0, -2.0],
  // 60
-  [ 0,-1, 2, 2, 2,     -2647.0,      0.0,     11.0,    1129.0,     0.0,     5.0],
+  [0, -1, 2, 2, 2, -2647.0, 0.0, 11.0, 1129.0, 0.0, 5.0],
  // 61
-  [-2, 0, 0, 0, 1,     -2294.0,      0.0,    -10.0,    1266.0,     0.0,    -4.0],
+  [-2, 0, 0, 0, 1, -2294.0, 0.0, -10.0, 1266.0, 0.0, -4.0],
  // 62
-  [ 1, 1, 2, 0, 2,      2481.0,      0.0,     -7.0,   -1062.0,     0.0,    -3.0],
+  [1, 1, 2, 0, 2, 2481.0, 0.0, -7.0, -1062.0, 0.0, -3.0],
  // 63
-  [ 2, 0, 0, 0, 1,      2179.0,      0.0,     -2.0,   -1129.0,     0.0,    -2.0],
+  [2, 0, 0, 0, 1, 2179.0, 0.0, -2.0, -1129.0, 0.0, -2.0],
  // 64
-  [-1, 1, 0, 1, 0,      3276.0,      0.0,      1.0,      -9.0,     0.0,     0.0],
+  [-1, 1, 0, 1, 0, 3276.0, 0.0, 1.0, -9.0, 0.0, 0.0],
  // 65
-  [ 1, 1, 0, 0, 0,     -3389.0,      0.0,      5.0,      35.0,     0.0,    -2.0],
+  [1, 1, 0, 0, 0, -3389.0, 0.0, 5.0, 35.0, 0.0, -2.0],
  // 66
-  [ 1, 0, 2, 0, 0,      3339.0,      0.0,    -13.0,    -107.0,     0.0,     1.0],
+  [1, 0, 2, 0, 0, 3339.0, 0.0, -13.0, -107.0, 0.0, 1.0],
  // 67
-  [-1, 0, 2,-2, 1,     -1987.0,      0.0,     -6.0,    1073.0,     0.0,    -2.0],
+  [-1, 0, 2, -2, 1, -1987.0, 0.0, -6.0, 1073.0, 0.0, -2.0],
  // 68
-  [ 1, 0, 0, 0, 2,     -1981.0,      0.0,      0.0,     854.0,     0.0,     0.0],
+  [1, 0, 0, 0, 2, -1981.0, 0.0, 0.0, 854.0, 0.0, 0.0],
  // 69
-  [-1, 0, 0, 1, 0,      4026.0,      0.0,   -353.0,    -553.0,     0.0,  -139.0],
+  [-1, 0, 0, 1, 0, 4026.0, 0.0, -353.0, -553.0, 0.0, -139.0],
  // 70
-  [ 0, 0, 2, 1, 2,      1660.0,      0.0,     -5.0,    -710.0,     0.0,    -2.0],
+  [0, 0, 2, 1, 2, 1660.0, 0.0, -5.0, -710.0, 0.0, -2.0],
  // 71
-  [-1, 0, 2, 4, 2,     -1521.0,      0.0,      9.0,     647.0,     0.0,     4.0],
+  [-1, 0, 2, 4, 2, -1521.0, 0.0, 9.0, 647.0, 0.0, 4.0],
  // 72
-  [-1, 1, 0, 1, 1,      1464.0,      0.0,    -11.0,    -527.0,     0.0,    -1.0],
+  [-1, 1, 0, 1, 1, 1464.0, 0.0, -11.0, -527.0, 0.0, -1.0],
  // 73
-  [ 0,-2, 2,-2, 1,     -1389.0,      0.0,      3.0,     656.0,     0.0,     1.0],
+  [0, -2, 2, -2, 1, -1389.0, 0.0, 3.0, 656.0, 0.0, 1.0],
  // 74
-  [ 1,-1, 2, 2, 2,     -1377.0,      0.0,      8.0,     594.0,     0.0,     4.0],
+  [1, -1, 2, 2, 2, -1377.0, 0.0, 8.0, 594.0, 0.0, 4.0],
  // 75
-  [ 3, 0, 2,-2, 2,      1371.0,      0.0,     -2.0,    -588.0,     0.0,    -1.0],
+  [3, 0, 2, -2, 2, 1371.0, 0.0, -2.0, -588.0, 0.0, -1.0],
  // 76
-  [ 0, 0, 4,-2, 4,      1341.0,      0.0,      0.0,    -577.0,     0.0,     0.0],
+  [0, 0, 4, -2, 4, 1341.0, 0.0, 0.0, -577.0, 0.0, 0.0],
  // 77
-  [ 0, 0, 2,-2, 4,     -1316.0,      0.0,      0.0,     567.0,     0.0,     0.0],
+  [0, 0, 2, -2, 4, -1316.0, 0.0, 0.0, 567.0, 0.0, 0.0],
 ]

 // ─── Fundamental arguments (Delaunay) ────────────────────────────────────────
@ -224,35 +222,35 @@ function arcsecToRad(arcsec: number): number {
 /** Mean anomaly of the Moon l (IAU 2003) */
 function fundamentalL(T: number): number {
  return arcsecToRad(
-    485868.249036 + T * (1717915923.2178 + T * (31.8792 + T * (0.051635 + T * (-0.00024470))))
+    485868.249036 + T * (1717915923.2178 + T * (31.8792 + T * (0.051635 + T * -0.0002447))),
  )
 }

 /** Mean anomaly of the Sun l' (IAU 2003) */
 function fundamentalLp(T: number): number {
  return arcsecToRad(
-    1287104.793048 + T * (129596581.0481 + T * (-0.5532 + T * (0.000136 + T * (-0.00001149))))
+    1287104.793048 + T * (129596581.0481 + T * (-0.5532 + T * (0.000136 + T * -0.00001149))),
  )
 }

 /** Moon's argument of latitude F = L - Ω (IAU 2003) */
 function fundamentalF(T: number): number {
  return arcsecToRad(
-    335779.526232 + T * (1739527262.8478 + T * (-12.7512 + T * (-0.001037 + T * 0.00000417)))
+    335779.526232 + T * (1739527262.8478 + T * (-12.7512 + T * (-0.001037 + T * 0.00000417))),
  )
 }

 /** Mean elongation of the Moon D (IAU 2003) */
 function fundamentalD(T: number): number {
  return arcsecToRad(
-    1072260.703692 + T * (1602961601.2090 + T * (-6.3706 + T * (0.006593 + T * (-0.00003169))))
+    1072260.703692 + T * (1602961601.209 + T * (-6.3706 + T * (0.006593 + T * -0.00003169))),
  )
 }

 /** Longitude of Moon's ascending node Ω (IAU 2003) */
 function fundamentalOm(T: number): number {
  return arcsecToRad(
-    450160.398036 + T * (-6962890.5431 + T * (7.4722 + T * (0.007702 + T * (-0.00005939))))
+    450160.398036 + T * (-6962890.5431 + T * (7.4722 + T * (0.007702 + T * -0.00005939))),
  )
 }

@ -274,24 +272,21 @@ function fundamentalOm(T: number): number {
 * @param jdTT - Julian Date in TT
 * @returns { X, Y, s } in radians
 */
-export function computeCIPXYs(
-  jdTT: number,
-): { X: number; Y: number; s: number } {
-
+export function computeCIPXYs(jdTT: number): { X: number; Y: number; s: number } {
  const T = (jdTT - J2000) / DAYS_PER_JULIAN_CENTURY

  // Delaunay fundamental arguments
-  const l  = fundamentalL(T)
+  const l = fundamentalL(T)
  const lp = fundamentalLp(T)
-  const F  = fundamentalF(T)
-  const D  = fundamentalD(T)
+  const F = fundamentalF(T)
+  const D = fundamentalD(T)
  const Om = fundamentalOm(T)

  // Accumulate nutation in longitude (dpsi) and obliquity (deps) — units: 0.1 uas
  let dpsi = 0.0
  let deps = 0.0
  for (const [nl, nlp, nF, nD, nOm, ps, pst, pc, ec, ect, es] of NUT_2000B) {
-    const arg = nl*l + nlp*lp + nF*F + nD*D + nOm*Om
+    const arg = nl * l + nlp * lp + nF * F + nD * D + nOm * Om
    const sinA = Math.sin(arg)
    const cosA = Math.cos(arg)
    dpsi += (ps + pst * T) * sinA + pc * cosA
@ -304,34 +299,24 @@ export function computeCIPXYs(

  // Mean obliquity eps0 (IAU 2006, arcseconds → radians)
  // Reference: IERS Conventions (2010) Table 5.1
-  const eps0 = (
-    84381.406
-    + T * (-46.836769
-    + T * (-0.0001831
-    + T * ( 0.00200340
-    + T * (-0.000000576
-    + T * (-0.0000000434)))))
-  ) * ARCSEC_RAD
+  const eps0 =
+    (84381.406 +
+      T *
+        (-46.836769 +
+          T * (-0.0001831 + T * (0.0020034 + T * (-0.000000576 + T * -0.0000000434))))) *
+    ARCSEC_RAD

  // IAU 2006 precession polynomial for X (arcseconds)
  // Reference: IERS Conventions (2010) Table 5.2a, polynomial s_X
  const Xarcsec =
-    -0.016617
-    + T * ( 2004.191898
-    + T * (   -0.4297829
-    + T * (   -0.19861834
-    + T * (    0.000007578
-    + T *      0.0000059285))))
+    -0.016617 +
+    T * (2004.191898 + T * (-0.4297829 + T * (-0.19861834 + T * (0.000007578 + T * 0.0000059285))))

  // IAU 2006 precession polynomial for Y (arcseconds)
  // Reference: IERS Conventions (2010) Table 5.2a, polynomial s_Y
  const Yarcsec =
-    -0.006951
-    + T * (  -0.025896
-    + T * ( -22.4072747
-    + T * (   0.00190059
-    + T * (   0.001112526
-    + T *     0.0000001358))))
+    -0.006951 +
+    T * (-0.025896 + T * (-22.4072747 + T * (0.00190059 + T * (0.001112526 + T * 0.0000001358))))

  // CIP X, Y: precession polynomial + first-order nutation correction
  const X = Xarcsec * ARCSEC_RAD + dpsiRad * Math.sin(eps0)
@ -340,7 +325,7 @@ export function computeCIPXYs(
  // CIO locator s ≈ -X·Y/2 + small polynomial (IERS Conventions 2010 Eq. 5.9)
  // Polynomial term: s_poly ≈ -0.041775"·T (arcseconds)
  const sPoly = -0.041775 * T * ARCSEC_RAD
-  const s = -X * Y / 2 + sPoly
+  const s = (-X * Y) / 2 + sPoly

  return { X, Y, s }
 }
@ -361,7 +346,7 @@ export function computeCIPXYs(
 */
 export function computeERA(jdUT1: number): number {
  const Du = jdUT1 - 2451545.0
-  const era = 2 * Math.PI * (0.7790572732640 + 1.00273781191135448 * Du)
+  const era = 2 * Math.PI * (0.779057273264 + 1.0027378119113546 * Du)
  return ((era % (2 * Math.PI)) + 2 * Math.PI) % (2 * Math.PI)
 }

@ -422,12 +407,7 @@ export function polarMotionMatrix(xp: number, yp: number): Mat3 {
 * @param yp - Polar motion y (radians, default 0)
 * @returns Vector in ITRS frame (km)
 */
-export function gcrsToItrs(
-  gcrsVec: Vec3,
-  ts: TimeScales,
-  xp = 0,
-  yp = 0,
-): Vec3 {
+export function gcrsToItrs(gcrsVec: Vec3, ts: TimeScales, xp = 0, yp = 0): Vec3 {
  const { X, Y, s } = computeCIPXYs(ts.jdTT)
  const Q = celestialMotionMatrix(X, Y, s)
  const era = computeERA(ts.jdUT1)
@ -449,12 +429,7 @@ export function gcrsToItrs(
 * @param yp - Polar motion y (radians, default 0)
 * @returns Vector in GCRS frame (km)
 */
-export function itrsToGcrs(
-  itrsVec: Vec3,
-  ts: TimeScales,
-  xp = 0,
-  yp = 0,
-): Vec3 {
+export function itrsToGcrs(itrsVec: Vec3, ts: TimeScales, xp = 0, yp = 0): Vec3 {
  const { X, Y, s } = computeCIPXYs(ts.jdTT)
  const Q = celestialMotionMatrix(X, Y, s)
  const era = computeERA(ts.jdUT1)
--- a/src/math/index.ts
+++ b/src/math/index.ts
@ -36,11 +36,7 @@ export function vnorm(a: Vec3): number {

 /** Cross product */
 export function vcross(a: Vec3, b: Vec3): Vec3 {
-  return [
-    a[1] * b[2] - a[2] * b[1],
-    a[2] * b[0] - a[0] * b[2],
-    a[0] * b[1] - a[1] * b[0],
-  ]
+  return [a[1] * b[2] - a[2] * b[1], a[2] * b[0] - a[0] * b[2], a[0] * b[1] - a[1] * b[0]]
 }

 /** Unit vector (normalized) */
@ -59,11 +55,7 @@ export function angularSep(a: Vec3, b: Vec3): number {
 // ─── 3×3 matrix operations ────────────────────────────────────────────────────

 /** 3×3 matrix stored row-major as a 9-element tuple */
-export type Mat3 = [
-  number, number, number,
-  number, number, number,
-  number, number, number,
-]
+export type Mat3 = [number, number, number, number, number, number, number, number, number]

 /** Multiply 3×3 matrix by 3-vector */
 export function mvmul(m: Mat3, v: Vec3): Vec3 {
@ -77,15 +69,15 @@ export function mvmul(m: Mat3, v: Vec3): Vec3 {
 /** Multiply two 3×3 matrices */
 export function mmmul(a: Mat3, b: Mat3): Mat3 {
  return [
-    a[0]*b[0] + a[1]*b[3] + a[2]*b[6],
-    a[0]*b[1] + a[1]*b[4] + a[2]*b[7],
-    a[0]*b[2] + a[1]*b[5] + a[2]*b[8],
-    a[3]*b[0] + a[4]*b[3] + a[5]*b[6],
-    a[3]*b[1] + a[4]*b[4] + a[5]*b[7],
-    a[3]*b[2] + a[4]*b[5] + a[5]*b[8],
-    a[6]*b[0] + a[7]*b[3] + a[8]*b[6],
-    a[6]*b[1] + a[7]*b[4] + a[8]*b[7],
-    a[6]*b[2] + a[7]*b[5] + a[8]*b[8],
+    a[0] * b[0] + a[1] * b[3] + a[2] * b[6],
+    a[0] * b[1] + a[1] * b[4] + a[2] * b[7],
+    a[0] * b[2] + a[1] * b[5] + a[2] * b[8],
+    a[3] * b[0] + a[4] * b[3] + a[5] * b[6],
+    a[3] * b[1] + a[4] * b[4] + a[5] * b[7],
+    a[3] * b[2] + a[4] * b[5] + a[5] * b[8],
+    a[6] * b[0] + a[7] * b[3] + a[8] * b[6],
+    a[6] * b[1] + a[7] * b[4] + a[8] * b[7],
+    a[6] * b[2] + a[7] * b[5] + a[8] * b[8],
  ]
 }

@ -173,14 +165,18 @@ export function chebyshevEvalWithDerivative(
  if (n === 1) return [coeffs[0], 0]

  const x2 = 2 * x
-  let b2 = 0; let b1 = 0
-  let db2 = 0; let db1 = 0
+  let b2 = 0
+  let b1 = 0
+  let db2 = 0
+  let db1 = 0

  for (let k = n - 1; k >= 1; k--) {
    const b0 = coeffs[k] + x2 * b1 - b2
    const db0 = 2 * b1 + x2 * db1 - db2
-    b2 = b1; b1 = b0
-    db2 = db1; db1 = db0
+    b2 = b1
+    b1 = b0
+    db2 = db1
+    db1 = db0
  }

  const value = coeffs[0] + x * b1 - b2
@ -227,7 +223,7 @@ export function brentRoot(
  let c = a
  let fc = fa
  let mflag = true
-  let s = 0
+  let s: number
  let d = 0

  for (let i = 0; i < maxIter; i++) {
@ -289,12 +285,7 @@ export function brentRoot(
 * @param steps - Number of initial subdivision steps (default 48 for 30-min resolution over a day)
 * @returns Array of root locations
 */
-export function findRoots(
-  f: (t: number) => number,
-  a: number,
-  b: number,
-  steps = 48,
-): number[] {
+export function findRoots(f: (t: number) => number, a: number, b: number, steps = 48): number[] {
  const dt = (b - a) / steps
  const roots: number[] = []
  let tPrev = a
--- a/src/observer/index.ts
+++ b/src/observer/index.ts
@ -21,6 +21,7 @@
 import type { Vec3, Observer, AzAlt, TimeScales } from '../types.js'
 import { WGS84 } from '../types.js'
 import { gcrsToItrs } from '../frames/index.js'
+import { vdot } from '../math/index.js'

 // ─── Geodetic ↔ ECEF ─────────────────────────────────────────────────────────

@ -93,12 +94,14 @@ export function ecefToGeodetic(ecef: Vec3): { lat: number; lon: number; h: numbe
 export function computeENUBasis(lat: number, lon: number): { east: Vec3; north: Vec3; up: Vec3 } {
  const phi = (lat * Math.PI) / 180
  const lam = (lon * Math.PI) / 180
-  const sinPhi = Math.sin(phi), cosPhi = Math.cos(phi)
-  const sinLam = Math.sin(lam), cosLam = Math.cos(lam)
+  const sinPhi = Math.sin(phi),
+    cosPhi = Math.cos(phi)
+  const sinLam = Math.sin(lam),
+    cosLam = Math.cos(lam)

  const east: Vec3 = [-sinLam, cosLam, 0]
  const north: Vec3 = [-sinPhi * cosLam, -sinPhi * sinLam, cosPhi]
-  const up: Vec3    = [ cosPhi * cosLam,  cosPhi * sinLam, sinPhi]
+  const up: Vec3 = [cosPhi * cosLam, cosPhi * sinLam, sinPhi]

  return { east, north, up }
 }
@ -114,8 +117,7 @@ export function computeENUBasis(lat: number, lon: number): { east: Vec3; north:
 */
 export function ecefToENU(ecefDelta: Vec3, lat: number, lon: number): Vec3 {
  const { east, north, up } = computeENUBasis(lat, lon)
-  const dot = (a: Vec3, b: Vec3) => a[0]*b[0] + a[1]*b[1] + a[2]*b[2]
-  return [dot(ecefDelta, east), dot(ecefDelta, north), dot(ecefDelta, up)]
+  return [vdot(ecefDelta, east), vdot(ecefDelta, north), vdot(ecefDelta, up)]
 }

 /**
@ -185,7 +187,6 @@ export function computeAzAlt(
  ts: TimeScales,
  airless: boolean,
 ): AzAlt {
-
  // 1. Convert body position from GCRS to ITRS (km)
  const bodyITRS = gcrsToItrs(bodyGCRS, ts)

@ -194,11 +195,7 @@ export function computeAzAlt(
  const obsITRS: Vec3 = [obsECEF[0] / 1000, obsECEF[1] / 1000, obsECEF[2] / 1000]

  // 3. Displacement vector from observer to body in ITRS (km — magnitude doesn't matter)
-  const delta: Vec3 = [
-    bodyITRS[0] - obsITRS[0],
-    bodyITRS[1] - obsITRS[1],
-    bodyITRS[2] - obsITRS[2],
-  ]
+  const delta: Vec3 = [bodyITRS[0] - obsITRS[0], bodyITRS[1] - obsITRS[1], bodyITRS[2] - obsITRS[2]]

  // 4. Project onto local ENU basis at the observer's location
  const enu = ecefToENU(delta, observer.lat, observer.lon)
@ -208,11 +205,7 @@ export function computeAzAlt(

  // 6. Refraction correction
  if (!airless) {
-    azAlt.altitude = applyRefraction(
-      azAlt.altitude,
-      observer.pressure,
-      observer.temperature,
-    )
+    azAlt.altitude = applyRefraction(azAlt.altitude, observer.pressure, observer.temperature)
  }

  return azAlt
@ -261,11 +254,7 @@ export function bennettRefraction(
 * Apply refraction correction to an airless altitude.
 * Returns the apparent (observed) altitude.
 */
-export function applyRefraction(
-  airlessAlt: number,
-  pressure = 1013.25,
-  temperature = 15,
-): number {
+export function applyRefraction(airlessAlt: number, pressure = 1013.25, temperature = 15): number {
  return airlessAlt + bennettRefraction(airlessAlt, pressure, temperature)
 }

--- a/src/spk/index.ts
+++ b/src/spk/index.ts
@ -31,10 +31,10 @@ import { chebyshevEvalWithDerivative } from '../math/index.js'

 /** NAIF integer body IDs used in DE442S segment chaining */
 export const NAIF_IDS = {
-  SSB: 0,              // Solar System Barycenter
+  SSB: 0, // Solar System Barycenter
  MERCURY_BARYCENTER: 1,
  VENUS_BARYCENTER: 2,
-  EMB: 3,              // Earth-Moon Barycenter
+  EMB: 3, // Earth-Moon Barycenter
  MARS_BARYCENTER: 4,
  JUPITER_BARYCENTER: 5,
  SATURN_BARYCENTER: 6,
@ -107,7 +107,7 @@ export class SpkKernel {
  private findSeg(target: number, center: number, et: number): SpkSegment | null {
    const candidates = this.index.get(`${target}:${center}`)
    if (!candidates) return null
-    return candidates.find(s => et >= s.startET && et <= s.endET) ?? null
+    return candidates.find((s) => et >= s.startET && et <= s.endET) ?? null
  }

  private getChained(target: number, center: number, et: number): StateVector {
@ -174,7 +174,12 @@ export class SpkKernel {
 // ─── DAF parsing ──────────────────────────────────────────────────────────────

 function parseDafFileRecord(buffer: ArrayBuffer): {
-  nd: number; ni: number; fward: number; bward: number; free: number; le: boolean
+  nd: number
+  ni: number
+  fward: number
+  bward: number
+  free: number
+  le: boolean
 } {
  const dv = new DataView(buffer)

@ -214,7 +219,7 @@ function parseSummaryRecords(
    const nextRecord = dv.getFloat64(recOffset, le)
    const nSummaries = Math.round(dv.getFloat64(recOffset + 16, le))

-    let offset = recOffset + 24  // skip 3 control doubles (24 bytes)
+    let offset = recOffset + 24 // skip 3 control doubles (24 bytes)

    for (let i = 0; i < nSummaries; i++) {
      if (offset + summaryBytes > buffer.byteLength) break
@ -383,8 +388,18 @@ export function parseLsk(text: string): ReadonlyArray<readonly [number, number]>

  const block = match[1]
  const months: Record<string, number> = {
-    JAN: 1, FEB: 2, MAR: 3, APR: 4, MAY: 5, JUN: 6,
-    JUL: 7, AUG: 8, SEP: 9, OCT: 10, NOV: 11, DEC: 12,
+    JAN: 1,
+    FEB: 2,
+    MAR: 3,
+    APR: 4,
+    MAY: 5,
+    JUN: 6,
+    JUL: 7,
+    AUG: 8,
+    SEP: 9,
+    OCT: 10,
+    NOV: 11,
+    DEC: 12,
  }

  const pairRe = /(-?\d+(?:\.\d+)?)\s*,\s*@(\d{4})-([A-Z]{3})-(\d{1,2})/g
@ -400,8 +415,14 @@ export function parseLsk(text: string): ReadonlyArray<readonly [number, number]>
    const a = Math.floor((14 - month) / 12)
    const y = year + 4800 - a
    const mo = month + 12 * a - 3
-    const jdNoon = day + Math.floor((153 * mo + 2) / 5) + 365 * y +
-      Math.floor(y / 4) - Math.floor(y / 100) + Math.floor(y / 400) - 32045
+    const jdNoon =
+      day +
+      Math.floor((153 * mo + 2) / 5) +
+      365 * y +
+      Math.floor(y / 4) -
+      Math.floor(y / 100) +
+      Math.floor(y / 400) -
+      32045
    // Midnight = JD - 0.5
    results.push([jdNoon - 0.5, deltaAT])
  }
--- a/src/time/index.ts
+++ b/src/time/index.ts
@ -202,55 +202,74 @@ export function deltaTPolynomial(jdTT: number): number {
  } else if (y < 500) {
    const u = y / 100
    return (
-      10583.6 - 1014.41 * u + 33.78311 * u * u - 5.952053 * u * u * u -
-      0.1798452 * u ** 4 + 0.022174192 * u ** 5 + 0.0090316521 * u ** 6
+      10583.6 -
+      1014.41 * u +
+      33.78311 * u * u -
+      5.952053 * u * u * u -
+      0.1798452 * u ** 4 +
+      0.022174192 * u ** 5 +
+      0.0090316521 * u ** 6
    )
  } else if (y < 1600) {
    const u = (y - 1000) / 100
    return (
-      1574.2 - 556.01 * u + 71.23472 * u * u + 0.319781 * u ** 3 -
-      0.8503463 * u ** 4 - 0.005050998 * u ** 5 + 0.0083572073 * u ** 6
+      1574.2 -
+      556.01 * u +
+      71.23472 * u * u +
+      0.319781 * u ** 3 -
+      0.8503463 * u ** 4 -
+      0.005050998 * u ** 5 +
+      0.0083572073 * u ** 6
    )
  } else if (y < 1700) {
    const t = y - 1600
    return 120 - 0.9808 * t - 0.01532 * t * t + t ** 3 / 7129
  } else if (y < 1800) {
    const t = y - 1700
-    return (
-      8.83 + 0.1603 * t - 0.0059285 * t * t + 0.00013336 * t ** 3 - t ** 4 / 1174000
-    )
+    return 8.83 + 0.1603 * t - 0.0059285 * t * t + 0.00013336 * t ** 3 - t ** 4 / 1174000
  } else if (y < 1860) {
    const t = y - 1800
    return (
-      13.72 - 0.332447 * t + 0.0068612 * t * t + 0.0041116 * t ** 3 -
-      0.00037436 * t ** 4 + 0.0000121272 * t ** 5 -
-      0.0000001699 * t ** 6 + 0.000000000875 * t ** 7
+      13.72 -
+      0.332447 * t +
+      0.0068612 * t * t +
+      0.0041116 * t ** 3 -
+      0.00037436 * t ** 4 +
+      0.0000121272 * t ** 5 -
+      0.0000001699 * t ** 6 +
+      0.000000000875 * t ** 7
    )
  } else if (y < 1900) {
    const t = y - 1860
    return (
-      7.62 + 0.5737 * t - 0.251754 * t * t + 0.01680668 * t ** 3 -
-      0.0004473624 * t ** 4 + t ** 5 / 233174
+      7.62 +
+      0.5737 * t -
+      0.251754 * t * t +
+      0.01680668 * t ** 3 -
+      0.0004473624 * t ** 4 +
+      t ** 5 / 233174
    )
  } else if (y < 1920) {
    const t = y - 1900
-    return (
-      -2.79 + 1.494119 * t - 0.0598939 * t * t + 0.0061966 * t ** 3 - 0.000197 * t ** 4
-    )
+    return -2.79 + 1.494119 * t - 0.0598939 * t * t + 0.0061966 * t ** 3 - 0.000197 * t ** 4
  } else if (y < 1941) {
    const t = y - 1920
-    return 21.20 + 0.84493 * t - 0.076100 * t * t + 0.0020936 * t ** 3
+    return 21.2 + 0.84493 * t - 0.0761 * t * t + 0.0020936 * t ** 3
  } else if (y < 1961) {
    const t = y - 1950
-    return 29.07 + 0.407 * t - t * t / 233 + t ** 3 / 2547
+    return 29.07 + 0.407 * t - (t * t) / 233 + t ** 3 / 2547
  } else if (y < 1986) {
    const t = y - 1975
-    return 45.45 + 1.067 * t - t * t / 260 - t ** 3 / 718
+    return 45.45 + 1.067 * t - (t * t) / 260 - t ** 3 / 718
  } else if (y < 2005) {
    const t = y - 2000
    return (
-      63.86 + 0.3345 * t - 0.060374 * t * t + 0.0017275 * t ** 3 +
-      0.000651814 * t ** 4 + 0.00002373599 * t ** 5
+      63.86 +
+      0.3345 * t -
+      0.060374 * t * t +
+      0.0017275 * t ** 3 +
+      0.000651814 * t ** 4 +
+      0.00002373599 * t ** 5
    )
  } else if (y < 2050) {
    const t = y - 2000
--- a/src/types.ts
+++ b/src/types.ts
@ -5,8 +5,8 @@ export type Vec3 = [number, number, number]

 /** Position + velocity state vector from the ephemeris */
 export interface StateVector {
-  position: Vec3  // km, in the frame determined by context
-  velocity: Vec3  // km/s
+  position: Vec3 // km, in the frame determined by context
+  velocity: Vec3 // km/s
 }

 /** Azimuth + altitude in degrees */
@ -154,7 +154,7 @@ export type YallopCategory = 'A' | 'B' | 'C' | 'D' | 'E' | 'F'
 export const YALLOP_THRESHOLDS = {
  A: 0.216,
  B: -0.014,
-  C: -0.160,
+  C: -0.16,
  D: -0.232,
  E: -0.293,
 } as const
@ -199,7 +199,7 @@ export type OdehZone = 'A' | 'B' | 'C' | 'D'
 */
 export const ODEH_THRESHOLDS = {
  A: 5.65,
-  B: 2.00,
+  B: 2.0,
  C: -0.96,
 } as const

@ -390,7 +390,7 @@ export type KernelSource =
  | { type: 'file'; path: string }
  | { type: 'buffer'; data: ArrayBuffer; name: string }
  | { type: 'url'; url: string }
-  | { type: 'auto' }  // auto-download from NAIF, cache in ~/.cache/moon-sighting
+  | { type: 'auto' } // auto-download from NAIF, cache in ~/.cache/moon-sighting

 export interface KernelConfig {
  /** Planetary SPK kernel — defaults to de442s.bsp via auto-download */
@ -434,9 +434,13 @@ export const WGS84 = {
  /** Flattening */
  f: 1 / 298.257223563,
  /** Semi-minor axis in meters */
-  get b() { return this.a * (1 - this.f) },
+  get b() {
+    return this.a * (1 - this.f)
+  },
  /** First eccentricity squared */
-  get e2() { return 2 * this.f - this.f * this.f },
+  get e2() {
+    return 2 * this.f - this.f * this.f
+  },
 } as const

 // ─── Internal ephemeris types ─────────────────────────────────────────────────
--- a/src/visibility/index.ts
+++ b/src/visibility/index.ts
@ -238,7 +238,10 @@ export function buildGuidanceText(
  lagMinutes: number,
 ): string {
  const direction = azimuthToCardinal(moonAz)
-  const timeStr = bestTimeUTC.toISOString().replace('T', ' ').replace(/\.\d+Z$/, ' UTC')
+  const timeStr = bestTimeUTC
+    .toISOString()
+    .replace('T', ' ')
+    .replace(/\.\d+Z$/, ' UTC')
  const lagStr = `${Math.round(lagMinutes)} min after sunset`

  let visibility: string
@ -263,8 +266,24 @@ export function buildGuidanceText(

 /** Convert azimuth degrees to a cardinal/intercardinal direction label */
 function azimuthToCardinal(az: number): string {
-  const dirs = ['North', 'NNE', 'NE', 'ENE', 'East', 'ESE', 'SE', 'SSE',
-    'South', 'SSW', 'SW', 'WSW', 'West', 'WNW', 'NW', 'NNW']
+  const dirs = [
+    'North',
+    'NNE',
+    'NE',
+    'ENE',
+    'East',
+    'ESE',
+    'SE',
+    'SSE',
+    'South',
+    'SSW',
+    'SW',
+    'WSW',
+    'West',
+    'WNW',
+    'NW',
+    'NNW',
+  ]
  const idx = Math.round(az / 22.5) % 16
  return dirs[(idx + 16) % 16]
 }
--- a/test-cjs.cjs
+++ b/test-cjs.cjs
@ -2,10 +2,11 @@

 /**
 * moon-sighting CJS test suite
- * Runs with: node test-cjs.cjs
+ * Runs with: node --test test-cjs.cjs
 * Verifies the CommonJS build is functional.
 */

+const { describe, it } = require('node:test')
 const assert = require('node:assert/strict')
 const {
  YALLOP_THRESHOLDS,
@ -25,142 +26,122 @@ const {
  getSunMoonEvents,
 } = require('./dist/index.cjs')

-let passed = 0
-let failed = 0
-
-function test(name, fn) {
-  try {
-    fn()
-    console.log(`  [${name}]... PASS`)
-    passed++
-  } catch (err) {
-    console.error(`  [${name}]... FAIL: ${err.message}`)
-    failed++
-  }
-}
-
-console.log('CJS compatibility:')
-
-test('require() works', () => {
-  assert.ok(YALLOP_THRESHOLDS !== undefined)
-})
-test('YALLOP_THRESHOLDS.A is 0.216', () => {
-  assert.equal(YALLOP_THRESHOLDS.A, 0.216)
-})
-test('ODEH_THRESHOLDS.A is 5.65', () => {
-  assert.equal(ODEH_THRESHOLDS.A, 5.65)
-})
-test('WGS84.a is 6378137.0', () => {
-  assert.equal(WGS84.a, 6378137.0)
-})
-test('All API functions are exported', () => {
-  assert.equal(typeof getMoonPhase, 'function')
-  assert.equal(typeof getMoonPosition, 'function')
-  assert.equal(typeof getMoonIllumination, 'function')
-  assert.equal(typeof getMoonVisibilityEstimate, 'function')
-  assert.equal(typeof getMoon, 'function')
-  assert.equal(typeof initKernels, 'function')
-  assert.equal(typeof downloadKernels, 'function')
-  assert.equal(typeof verifyKernels, 'function')
-  assert.equal(typeof getMoonSightingReport, 'function')
-  assert.equal(typeof getSunMoonEvents, 'function')
+describe('CJS compatibility', () => {
+  it('require() works', () => {
+    assert.ok(YALLOP_THRESHOLDS !== undefined)
+  })
+  it('YALLOP_THRESHOLDS.A is 0.216', () => {
+    assert.equal(YALLOP_THRESHOLDS.A, 0.216)
+  })
+  it('ODEH_THRESHOLDS.A is 5.65', () => {
+    assert.equal(ODEH_THRESHOLDS.A, 5.65)
+  })
+  it('WGS84.a is 6378137.0', () => {
+    assert.equal(WGS84.a, 6378137.0)
+  })
+  it('All API functions are exported', () => {
+    assert.equal(typeof getMoonPhase, 'function')
+    assert.equal(typeof getMoonPosition, 'function')
+    assert.equal(typeof getMoonIllumination, 'function')
+    assert.equal(typeof getMoonVisibilityEstimate, 'function')
+    assert.equal(typeof getMoon, 'function')
+    assert.equal(typeof initKernels, 'function')
+    assert.equal(typeof downloadKernels, 'function')
+    assert.equal(typeof verifyKernels, 'function')
+    assert.equal(typeof getMoonSightingReport, 'function')
+    assert.equal(typeof getSunMoonEvents, 'function')
+  })
 })

-console.log('\nCJS getMoonPhase:')
-
-test('getMoonPhase returns valid phase', () => {
-  const valid = new Set([
-    'new-moon', 'waxing-crescent', 'first-quarter', 'waxing-gibbous',
-    'full-moon', 'waning-gibbous', 'last-quarter', 'waning-crescent',
-  ])
-  const p = getMoonPhase(new Date('2025-03-14T12:00:00Z'))
-  assert.ok(valid.has(p.phase), `got: ${p.phase}`)
-})
-test('getMoonPhase illumination in [0, 100]', () => {
-  const p = getMoonPhase(new Date('2025-03-01T12:00:00Z'))
-  assert.ok(p.illumination >= 0 && p.illumination <= 100)
-})
-test('getMoonPhase near full moon has high illumination', () => {
-  const p = getMoonPhase(new Date('2025-03-14T12:00:00Z'))
-  assert.ok(p.illumination > 85, `illumination=${p.illumination.toFixed(1)}%`)
-})
-test('getMoonPhase Dates are Date objects', () => {
-  const p = getMoonPhase(new Date('2025-03-01T12:00:00Z'))
-  assert.ok(p.nextNewMoon instanceof Date)
-  assert.ok(p.prevNewMoon instanceof Date)
-  assert.ok(p.nextFullMoon instanceof Date)
+describe('CJS getMoonPhase', () => {
+  it('returns valid phase', () => {
+    const valid = new Set([
+      'new-moon', 'waxing-crescent', 'first-quarter', 'waxing-gibbous',
+      'full-moon', 'waning-gibbous', 'last-quarter', 'waning-crescent',
+    ])
+    const p = getMoonPhase(new Date('2025-03-14T12:00:00Z'))
+    assert.ok(valid.has(p.phase), `got: ${p.phase}`)
+  })
+  it('illumination in [0, 100]', () => {
+    const p = getMoonPhase(new Date('2025-03-01T12:00:00Z'))
+    assert.ok(p.illumination >= 0 && p.illumination <= 100)
+  })
+  it('near full moon has high illumination', () => {
+    const p = getMoonPhase(new Date('2025-03-14T12:00:00Z'))
+    assert.ok(p.illumination > 85, `illumination=${p.illumination.toFixed(1)}%`)
+  })
+  it('Dates are Date objects', () => {
+    const p = getMoonPhase(new Date('2025-03-01T12:00:00Z'))
+    assert.ok(p.nextNewMoon instanceof Date)
+    assert.ok(p.prevNewMoon instanceof Date)
+    assert.ok(p.nextFullMoon instanceof Date)
+  })
 })

-console.log('\nCJS getMoonPosition + getMoonIllumination:')
-
-test('getMoonPosition returns valid azimuth/altitude', () => {
-  const pos = getMoonPosition(new Date('2025-03-14T20:00:00Z'), 51.5074, -0.1278, 10)
-  assert.ok(pos.azimuth >= 0 && pos.azimuth < 360, `azimuth=${pos.azimuth}`)
-  assert.ok(pos.altitude >= -90 && pos.altitude <= 90, `altitude=${pos.altitude}`)
-  assert.ok(pos.distance > 356000 && pos.distance < 407000, `distance=${pos.distance}`)
-  assert.ok(isFinite(pos.parallacticAngle))
-})
-test('getMoonIllumination near full moon: fraction > 0.85', () => {
-  const illum = getMoonIllumination(new Date('2025-03-14T12:00:00Z'))
-  assert.ok(illum.fraction > 0.85, `fraction=${illum.fraction.toFixed(3)}`)
-  assert.ok(illum.phase > 0.4 && illum.phase < 0.6, `phase=${illum.phase.toFixed(3)}`)
-  assert.ok(isFinite(illum.angle))
-})
-test('getMoonIllumination waxing: isWaxing = true', () => {
-  const illum = getMoonIllumination(new Date('2025-03-05T12:00:00Z'))
-  assert.equal(illum.isWaxing, true)
+describe('CJS getMoonPosition and getMoonIllumination', () => {
+  it('getMoonPosition returns valid azimuth/altitude', () => {
+    const pos = getMoonPosition(new Date('2025-03-14T20:00:00Z'), 51.5074, -0.1278, 10)
+    assert.ok(pos.azimuth >= 0 && pos.azimuth < 360, `azimuth=${pos.azimuth}`)
+    assert.ok(pos.altitude >= -90 && pos.altitude <= 90, `altitude=${pos.altitude}`)
+    assert.ok(pos.distance > 356000 && pos.distance < 407000, `distance=${pos.distance}`)
+    assert.ok(isFinite(pos.parallacticAngle))
+  })
+  it('getMoonIllumination near full moon: fraction > 0.85', () => {
+    const illum = getMoonIllumination(new Date('2025-03-14T12:00:00Z'))
+    assert.ok(illum.fraction > 0.85, `fraction=${illum.fraction.toFixed(3)}`)
+    assert.ok(illum.phase > 0.4 && illum.phase < 0.6, `phase=${illum.phase.toFixed(3)}`)
+    assert.ok(isFinite(illum.angle))
+  })
+  it('getMoonIllumination waxing: isWaxing = true', () => {
+    const illum = getMoonIllumination(new Date('2025-03-05T12:00:00Z'))
+    assert.equal(illum.isWaxing, true)
+  })
 })

-console.log('\nCJS getMoonPhase phaseName/phaseSymbol:')
-
-test('getMoonPhase.phaseName is a non-empty string', () => {
-  const p = getMoonPhase(new Date('2025-03-05T12:00:00Z'))
-  assert.ok(typeof p.phaseName === 'string' && p.phaseName.length > 0)
-})
-test('getMoonPhase.phaseSymbol is a moon emoji', () => {
-  const SYMBOLS = new Set(['🌑', '🌒', '🌓', '🌔', '🌕', '🌖', '🌗', '🌘'])
-  const p = getMoonPhase(new Date('2025-03-05T12:00:00Z'))
-  assert.ok(SYMBOLS.has(p.phaseSymbol), `got: ${p.phaseSymbol}`)
-})
-test('Waxing crescent: phaseName = "Waxing Crescent", phaseSymbol = "🌒"', () => {
-  const p = getMoonPhase(new Date('2025-03-05T12:00:00Z'))
-  assert.equal(p.phaseName, 'Waxing Crescent')
-  assert.equal(p.phaseSymbol, '🌒')
+describe('CJS getMoonPhase phaseName/phaseSymbol', () => {
+  it('phaseName is a non-empty string', () => {
+    const p = getMoonPhase(new Date('2025-03-05T12:00:00Z'))
+    assert.ok(typeof p.phaseName === 'string' && p.phaseName.length > 0)
+  })
+  it('phaseSymbol is a moon emoji', () => {
+    const SYMBOLS = new Set(['🌑', '🌒', '🌓', '🌔', '🌕', '🌖', '🌗', '🌘'])
+    const p = getMoonPhase(new Date('2025-03-05T12:00:00Z'))
+    assert.ok(SYMBOLS.has(p.phaseSymbol), `got: ${p.phaseSymbol}`)
+  })
+  it('Waxing crescent: correct phaseName and phaseSymbol', () => {
+    const p = getMoonPhase(new Date('2025-03-05T12:00:00Z'))
+    assert.equal(p.phaseName, 'Waxing Crescent')
+    assert.equal(p.phaseSymbol, '🌒')
+  })
 })

-console.log('\nCJS getMoonVisibilityEstimate:')
-
-test('getMoonVisibilityEstimate returns valid zone', () => {
-  const v = getMoonVisibilityEstimate(new Date('2025-03-02T18:30:00Z'), 51.5074, -0.1278, 10)
-  assert.ok(['A', 'B', 'C', 'D'].includes(v.zone), `zone=${v.zone}`)
-  assert.ok(isFinite(v.V))
-  assert.equal(v.isApproximate, true)
-})
-test('getMoonVisibilityEstimate near new moon: zone C or D', () => {
-  const v = getMoonVisibilityEstimate(new Date('2025-03-29T18:00:00Z'), 21.4225, 39.8262)
-  assert.ok(['C', 'D'].includes(v.zone), `zone=${v.zone}`)
+describe('CJS getMoonVisibilityEstimate', () => {
+  it('returns valid zone', () => {
+    const v = getMoonVisibilityEstimate(new Date('2025-03-02T18:30:00Z'), 51.5074, -0.1278, 10)
+    assert.ok(['A', 'B', 'C', 'D'].includes(v.zone), `zone=${v.zone}`)
+    assert.ok(isFinite(v.V))
+    assert.equal(v.isApproximate, true)
+  })
+  it('near new moon: zone C or D', () => {
+    const v = getMoonVisibilityEstimate(new Date('2025-03-29T18:00:00Z'), 21.4225, 39.8262)
+    assert.ok(['C', 'D'].includes(v.zone), `zone=${v.zone}`)
+  })
 })

-console.log('\nCJS getMoon:')
-
-test('getMoon returns all four sub-results', () => {
-  const m = getMoon(new Date('2025-03-05T20:00:00Z'), 51.5074, -0.1278, 10)
-  assert.ok(typeof m.phase === 'object')
-  assert.ok(typeof m.position === 'object')
-  assert.ok(typeof m.illumination === 'object')
-  assert.ok(typeof m.visibility === 'object')
+describe('CJS getMoon', () => {
+  it('returns all four sub-results', () => {
+    const m = getMoon(new Date('2025-03-05T20:00:00Z'), 51.5074, -0.1278, 10)
+    assert.ok(typeof m.phase === 'object')
+    assert.ok(typeof m.position === 'object')
+    assert.ok(typeof m.illumination === 'object')
+    assert.ok(typeof m.visibility === 'object')
+  })
+  it('phase.phaseName is non-empty', () => {
+    const m = getMoon(new Date('2025-03-05T20:00:00Z'), 51.5074, -0.1278)
+    assert.ok(typeof m.phase.phaseName === 'string' && m.phase.phaseName.length > 0)
+  })
+  it('visibility.isApproximate is true', () => {
+    const m = getMoon(new Date(), 51.5074, -0.1278)
+    assert.equal(m.visibility.isApproximate, true)
+  })
 })
-test('getMoon.phase.phaseName is non-empty', () => {
-  const m = getMoon(new Date('2025-03-05T20:00:00Z'), 51.5074, -0.1278)
-  assert.ok(typeof m.phase.phaseName === 'string' && m.phase.phaseName.length > 0)
-})
-test('getMoon.visibility.isApproximate is true', () => {
-  const m = getMoon(new Date(), 51.5074, -0.1278)
-  assert.equal(m.visibility.isApproximate, true)
-})
-
-console.log(`\n${passed + failed} tests: ${passed} passed, ${failed} failed`)
-
-if (failed > 0) {
-  process.exit(1)
-}
--- a/test.mjs
+++ b/test.mjs
@ -1,9 +1,9 @@
 /**
 * moon-sighting ESM test suite
- * Runs with: node test.mjs
- * All tests use plain assert — no test framework.
+ * Runs with: node --test test.mjs
 */

+import { describe, it } from 'node:test'
 import assert from 'node:assert/strict'

 import {
@ -26,429 +26,392 @@ import {
  getSunMoonEvents,
 } from './dist/index.mjs'

-let passed = 0
-let failed = 0
-
-function test(name, fn) {
-  try {
-    fn()
-    console.log(`  [${name}]... PASS`)
-    passed++
-  } catch (err) {
-    console.error(`  [${name}]... FAIL: ${err.message}`)
-    failed++
-  }
-}
-
 // ─── Constants ────────────────────────────────────────────────────────────────

-console.log('Constants:')
-
-test('YALLOP_THRESHOLDS.A is 0.216', () => {
-  assert.equal(YALLOP_THRESHOLDS.A, 0.216)
-})
-test('YALLOP_THRESHOLDS.E is -0.293', () => {
-  assert.equal(YALLOP_THRESHOLDS.E, -0.293)
-})
-test('All Yallop thresholds are defined', () => {
-  for (const key of ['A', 'B', 'C', 'D', 'E']) {
-    assert.ok(typeof YALLOP_THRESHOLDS[key] === 'number', `${key} should be a number`)
-  }
-})
-test('Yallop thresholds descend A > B > C > D > E', () => {
-  assert.ok(YALLOP_THRESHOLDS.A > YALLOP_THRESHOLDS.B)
-  assert.ok(YALLOP_THRESHOLDS.B > YALLOP_THRESHOLDS.C)
-  assert.ok(YALLOP_THRESHOLDS.C > YALLOP_THRESHOLDS.D)
-  assert.ok(YALLOP_THRESHOLDS.D > YALLOP_THRESHOLDS.E)
-})
-test('ODEH_THRESHOLDS.A is 5.65', () => {
-  assert.equal(ODEH_THRESHOLDS.A, 5.65)
-})
-test('ODEH_THRESHOLDS.C is -0.96', () => {
-  assert.equal(ODEH_THRESHOLDS.C, -0.96)
-})
-test('Odeh thresholds descend A > B > C', () => {
-  assert.ok(ODEH_THRESHOLDS.A > ODEH_THRESHOLDS.B)
-  assert.ok(ODEH_THRESHOLDS.B > ODEH_THRESHOLDS.C)
-})
-test('WGS84.a is 6378137.0', () => {
-  assert.equal(WGS84.a, 6378137.0)
-})
-test('WGS84.invF is 298.257223563', () => {
-  assert.equal(WGS84.invF, 298.257223563)
-})
-test('WGS84.e2 is positive and < 1', () => {
-  assert.ok(WGS84.e2 > 0 && WGS84.e2 < 1, `e2=${WGS84.e2}`)
-})
-test('WGS84.b < WGS84.a (oblate spheroid)', () => {
-  assert.ok(WGS84.b < WGS84.a)
-})
-test('Yallop descriptions are non-empty strings', () => {
-  for (const cat of ['A', 'B', 'C', 'D', 'E', 'F']) {
-    assert.ok(typeof YALLOP_DESCRIPTIONS[cat] === 'string' && YALLOP_DESCRIPTIONS[cat].length > 0)
-  }
-})
-test('Odeh descriptions are non-empty strings', () => {
-  for (const zone of ['A', 'B', 'C', 'D']) {
-    assert.ok(typeof ODEH_DESCRIPTIONS[zone] === 'string' && ODEH_DESCRIPTIONS[zone].length > 0)
-  }
+describe('Constants', () => {
+  it('YALLOP_THRESHOLDS.A is 0.216', () => {
+    assert.equal(YALLOP_THRESHOLDS.A, 0.216)
+  })
+  it('YALLOP_THRESHOLDS.E is -0.293', () => {
+    assert.equal(YALLOP_THRESHOLDS.E, -0.293)
+  })
+  it('All Yallop thresholds are defined', () => {
+    for (const key of ['A', 'B', 'C', 'D', 'E']) {
+      assert.ok(typeof YALLOP_THRESHOLDS[key] === 'number', `${key} should be a number`)
+    }
+  })
+  it('Yallop thresholds descend A > B > C > D > E', () => {
+    assert.ok(YALLOP_THRESHOLDS.A > YALLOP_THRESHOLDS.B)
+    assert.ok(YALLOP_THRESHOLDS.B > YALLOP_THRESHOLDS.C)
+    assert.ok(YALLOP_THRESHOLDS.C > YALLOP_THRESHOLDS.D)
+    assert.ok(YALLOP_THRESHOLDS.D > YALLOP_THRESHOLDS.E)
+  })
+  it('ODEH_THRESHOLDS.A is 5.65', () => {
+    assert.equal(ODEH_THRESHOLDS.A, 5.65)
+  })
+  it('ODEH_THRESHOLDS.C is -0.96', () => {
+    assert.equal(ODEH_THRESHOLDS.C, -0.96)
+  })
+  it('Odeh thresholds descend A > B > C', () => {
+    assert.ok(ODEH_THRESHOLDS.A > ODEH_THRESHOLDS.B)
+    assert.ok(ODEH_THRESHOLDS.B > ODEH_THRESHOLDS.C)
+  })
+  it('WGS84.a is 6378137.0', () => {
+    assert.equal(WGS84.a, 6378137.0)
+  })
+  it('WGS84.invF is 298.257223563', () => {
+    assert.equal(WGS84.invF, 298.257223563)
+  })
+  it('WGS84.e2 is positive and < 1', () => {
+    assert.ok(WGS84.e2 > 0 && WGS84.e2 < 1, `e2=${WGS84.e2}`)
+  })
+  it('WGS84.b < WGS84.a (oblate spheroid)', () => {
+    assert.ok(WGS84.b < WGS84.a)
+  })
+  it('Yallop descriptions are non-empty strings', () => {
+    for (const cat of ['A', 'B', 'C', 'D', 'E', 'F']) {
+      assert.ok(typeof YALLOP_DESCRIPTIONS[cat] === 'string' && YALLOP_DESCRIPTIONS[cat].length > 0)
+    }
+  })
+  it('Odeh descriptions are non-empty strings', () => {
+    for (const zone of ['A', 'B', 'C', 'D']) {
+      assert.ok(typeof ODEH_DESCRIPTIONS[zone] === 'string' && ODEH_DESCRIPTIONS[zone].length > 0)
+    }
+  })
 })

 // ─── API function exports ──────────────────────────────────────────────────────

-console.log('\nAPI exports:')
-
-test('getMoonPhase is a function', () => {
-  assert.equal(typeof getMoonPhase, 'function')
-})
-test('initKernels is a function', () => {
-  assert.equal(typeof initKernels, 'function')
-})
-test('downloadKernels is a function', () => {
-  assert.equal(typeof downloadKernels, 'function')
-})
-test('verifyKernels is a function', () => {
-  assert.equal(typeof verifyKernels, 'function')
-})
-test('getMoonSightingReport is a function', () => {
-  assert.equal(typeof getMoonSightingReport, 'function')
-})
-test('getSunMoonEvents is a function', () => {
-  assert.equal(typeof getSunMoonEvents, 'function')
+describe('API exports', () => {
+  it('getMoonPhase is a function', () => {
+    assert.equal(typeof getMoonPhase, 'function')
+  })
+  it('initKernels is a function', () => {
+    assert.equal(typeof initKernels, 'function')
+  })
+  it('downloadKernels is a function', () => {
+    assert.equal(typeof downloadKernels, 'function')
+  })
+  it('verifyKernels is a function', () => {
+    assert.equal(typeof verifyKernels, 'function')
+  })
+  it('getMoonSightingReport is a function', () => {
+    assert.equal(typeof getMoonSightingReport, 'function')
+  })
+  it('getSunMoonEvents is a function', () => {
+    assert.equal(typeof getSunMoonEvents, 'function')
+  })
 })

 // ─── getMoonPhase (synchronous, no kernel) ─────────────────────────────────────

-console.log('\ngetMoonPhase — structure:')
-
 const VALID_PHASES = new Set([
  'new-moon', 'waxing-crescent', 'first-quarter', 'waxing-gibbous',
  'full-moon', 'waning-gibbous', 'last-quarter', 'waning-crescent',
 ])

-// Test with a known reference date: 2025-03-01 UTC
-// At this date the Moon was a waxing crescent (~2 days after new moon Feb 28)
 const DATE_MARCH_1_2025 = new Date('2025-03-01T12:00:00Z')
 const phase_march1 = getMoonPhase(DATE_MARCH_1_2025)

-test('getMoonPhase returns an object', () => {
-  assert.ok(phase_march1 !== null && typeof phase_march1 === 'object')
-})
-test('getMoonPhase.phase is a valid phase name', () => {
-  assert.ok(VALID_PHASES.has(phase_march1.phase), `got: ${phase_march1.phase}`)
-})
-test('getMoonPhase.illumination is in [0, 100]', () => {
-  assert.ok(phase_march1.illumination >= 0 && phase_march1.illumination <= 100,
-    `illumination=${phase_march1.illumination}`)
-})
-test('getMoonPhase.age is >= 0', () => {
-  assert.ok(phase_march1.age >= 0, `age=${phase_march1.age}`)
-})
-test('getMoonPhase.elongationDeg is in [0, 180]', () => {
-  assert.ok(phase_march1.elongationDeg >= 0 && phase_march1.elongationDeg <= 180,
-    `elongationDeg=${phase_march1.elongationDeg}`)
-})
-test('getMoonPhase.isWaxing is a boolean', () => {
-  assert.equal(typeof phase_march1.isWaxing, 'boolean')
-})
-test('getMoonPhase.nextNewMoon is a Date', () => {
-  assert.ok(phase_march1.nextNewMoon instanceof Date)
-})
-test('getMoonPhase.prevNewMoon is a Date', () => {
-  assert.ok(phase_march1.prevNewMoon instanceof Date)
-})
-test('getMoonPhase.nextFullMoon is a Date', () => {
-  assert.ok(phase_march1.nextFullMoon instanceof Date)
-})
-test('getMoonPhase.prevNewMoon is before reference date', () => {
-  assert.ok(phase_march1.prevNewMoon < DATE_MARCH_1_2025,
-    `prevNewMoon=${phase_march1.prevNewMoon.toISOString()}`)
-})
-test('getMoonPhase.nextNewMoon is after prevNewMoon', () => {
-  assert.ok(phase_march1.nextNewMoon > phase_march1.prevNewMoon)
+describe('getMoonPhase structure', () => {
+  it('returns an object', () => {
+    assert.ok(phase_march1 !== null && typeof phase_march1 === 'object')
+  })
+  it('phase is a valid phase name', () => {
+    assert.ok(VALID_PHASES.has(phase_march1.phase), `got: ${phase_march1.phase}`)
+  })
+  it('illumination is in [0, 100]', () => {
+    assert.ok(phase_march1.illumination >= 0 && phase_march1.illumination <= 100,
+      `illumination=${phase_march1.illumination}`)
+  })
+  it('age is >= 0', () => {
+    assert.ok(phase_march1.age >= 0, `age=${phase_march1.age}`)
+  })
+  it('elongationDeg is in [0, 180]', () => {
+    assert.ok(phase_march1.elongationDeg >= 0 && phase_march1.elongationDeg <= 180,
+      `elongationDeg=${phase_march1.elongationDeg}`)
+  })
+  it('isWaxing is a boolean', () => {
+    assert.equal(typeof phase_march1.isWaxing, 'boolean')
+  })
+  it('nextNewMoon is a Date', () => {
+    assert.ok(phase_march1.nextNewMoon instanceof Date)
+  })
+  it('prevNewMoon is a Date', () => {
+    assert.ok(phase_march1.prevNewMoon instanceof Date)
+  })
+  it('nextFullMoon is a Date', () => {
+    assert.ok(phase_march1.nextFullMoon instanceof Date)
+  })
+  it('prevNewMoon is before reference date', () => {
+    assert.ok(phase_march1.prevNewMoon < DATE_MARCH_1_2025,
+      `prevNewMoon=${phase_march1.prevNewMoon.toISOString()}`)
+  })
+  it('nextNewMoon is after prevNewMoon', () => {
+    assert.ok(phase_march1.nextNewMoon > phase_march1.prevNewMoon)
+  })
 })

-console.log('\ngetMoonPhase — phase boundaries:')
+describe('getMoonPhase phase boundaries', () => {
+  const DATE_FULL_MOON = new Date('2025-03-14T12:00:00Z')
+  const phase_full = getMoonPhase(DATE_FULL_MOON)

-// 2025-03-14 was close to full moon (illumination should be high)
-const DATE_FULL_MOON = new Date('2025-03-14T12:00:00Z')
-const phase_full = getMoonPhase(DATE_FULL_MOON)
+  it('near full moon: illumination > 85%', () => {
+    assert.ok(phase_full.illumination > 85,
+      `illumination at full moon=${phase_full.illumination.toFixed(1)}%`)
+  })
+  it('near full moon: phase is full-moon or waxing/waning gibbous', () => {
+    const valid = new Set(['full-moon', 'waxing-gibbous', 'waning-gibbous'])
+    assert.ok(valid.has(phase_full.phase), `got: ${phase_full.phase}`)
+  })
+  it('near full moon: elongation > 120 deg', () => {
+    assert.ok(phase_full.elongationDeg > 120, `elongation=${phase_full.elongationDeg}`)
+  })

-test('Near full moon: illumination > 85%', () => {
-  assert.ok(phase_full.illumination > 85,
-    `illumination at full moon=${phase_full.illumination.toFixed(1)}%`)
-})
-test('Near full moon: phase is full-moon or waxing/waning gibbous', () => {
-  const valid = new Set(['full-moon', 'waxing-gibbous', 'waning-gibbous'])
-  assert.ok(valid.has(phase_full.phase), `got: ${phase_full.phase}`)
-})
-test('Near full moon: elongation > 120°', () => {
-  assert.ok(phase_full.elongationDeg > 120, `elongation=${phase_full.elongationDeg}`)
+  const DATE_NEW_MOON = new Date('2025-03-29T12:00:00Z')
+  const phase_new = getMoonPhase(DATE_NEW_MOON)
+
+  it('near new moon: illumination < 10%', () => {
+    assert.ok(phase_new.illumination < 10,
+      `illumination at new moon=${phase_new.illumination.toFixed(1)}%`)
+  })
+  it('near new moon: elongation < 30 deg', () => {
+    assert.ok(phase_new.elongationDeg < 30, `elongation=${phase_new.elongationDeg}`)
+  })
 })

-// 2025-03-29 is close to new moon (illumination should be low)
-const DATE_NEW_MOON = new Date('2025-03-29T12:00:00Z')
-const phase_new = getMoonPhase(DATE_NEW_MOON)
+describe('getMoonPhase consistency', () => {
+  const DATE_WAXING = new Date('2025-03-05T12:00:00Z')
+  const DATE_WANING = new Date('2025-03-20T12:00:00Z')

-test('Near new moon: illumination < 10%', () => {
-  assert.ok(phase_new.illumination < 10,
-    `illumination at new moon=${phase_new.illumination.toFixed(1)}%`)
-})
-test('Near new moon: elongation < 30°', () => {
-  assert.ok(phase_new.elongationDeg < 30, `elongation=${phase_new.elongationDeg}`)
-})
-
-console.log('\ngetMoonPhase — consistency:')
-
-// Two dates: one clearly waxing, one clearly waning
-const DATE_WAXING = new Date('2025-03-05T12:00:00Z')  // ~7 days after new moon
-const DATE_WANING = new Date('2025-03-20T12:00:00Z')  // ~6 days after full moon
-const phase_waxing = getMoonPhase(DATE_WAXING)
-const phase_waning = getMoonPhase(DATE_WANING)
-
-test('5 days after new moon: isWaxing = true', () => {
-  assert.equal(phase_waxing.isWaxing, true)
-})
-test('6 days after full moon: isWaxing = false', () => {
-  assert.equal(phase_waning.isWaxing, false)
-})
-test('getMoonPhase with default date (now) returns valid result', () => {
-  const nowPhase = getMoonPhase()
-  assert.ok(VALID_PHASES.has(nowPhase.phase))
-  assert.ok(nowPhase.illumination >= 0 && nowPhase.illumination <= 100)
-})
-
-// Synodic month duration check: nextNewMoon - prevNewMoon ≈ 29.53 days
-test('Synodic month duration is ~29.5 days (±0.5)', () => {
-  const synodicMs = phase_march1.nextNewMoon.getTime() - phase_march1.prevNewMoon.getTime()
-  const synodicDays = synodicMs / 86400000
-  assert.ok(
-    synodicDays > 29.0 && synodicDays < 30.1,
-    `synodic month=${synodicDays.toFixed(2)} days`,
-  )
+  it('5 days after new moon: isWaxing = true', () => {
+    assert.equal(getMoonPhase(DATE_WAXING).isWaxing, true)
+  })
+  it('6 days after full moon: isWaxing = false', () => {
+    assert.equal(getMoonPhase(DATE_WANING).isWaxing, false)
+  })
+  it('default date (now) returns valid result', () => {
+    const nowPhase = getMoonPhase()
+    assert.ok(VALID_PHASES.has(nowPhase.phase))
+    assert.ok(nowPhase.illumination >= 0 && nowPhase.illumination <= 100)
+  })
+  it('synodic month duration is ~29.5 days', () => {
+    const synodicMs = phase_march1.nextNewMoon.getTime() - phase_march1.prevNewMoon.getTime()
+    const synodicDays = synodicMs / 86400000
+    assert.ok(
+      synodicDays > 29.0 && synodicDays < 30.1,
+      `synodic month=${synodicDays.toFixed(2)} days`,
+    )
+  })
 })

 // ─── getMoonPosition ─────────────────────────────────────────────────────────

-console.log('\ngetMoonPosition:')
+describe('getMoonPosition', () => {
+  const moonPos_london = getMoonPosition(new Date('2025-03-14T20:00:00Z'), 51.5074, -0.1278, 10)

-// London on 2025-03-14 at noon UTC — Moon should be above the horizon during daytime
-const moonPos_london = getMoonPosition(new Date('2025-03-14T20:00:00Z'), 51.5074, -0.1278, 10)
-
-test('getMoonPosition returns azimuth in [0, 360)', () => {
-  assert.ok(
-    moonPos_london.azimuth >= 0 && moonPos_london.azimuth < 360,
-    `azimuth=${moonPos_london.azimuth}`,
-  )
-})
-test('getMoonPosition returns altitude in [-90, 90]', () => {
-  assert.ok(
-    moonPos_london.altitude >= -90 && moonPos_london.altitude <= 90,
-    `altitude=${moonPos_london.altitude}`,
-  )
-})
-test('getMoonPosition returns distance in lunar orbit range [356000, 407000] km', () => {
-  assert.ok(
-    moonPos_london.distance >= 356000 && moonPos_london.distance <= 407000,
-    `distance=${moonPos_london.distance.toFixed(0)} km`,
-  )
-})
-test('getMoonPosition returns finite parallacticAngle', () => {
-  assert.ok(
-    isFinite(moonPos_london.parallacticAngle),
-    `parallacticAngle=${moonPos_london.parallacticAngle}`,
-  )
-})
-test('getMoonPosition default date (now) returns valid result', () => {
-  const pos = getMoonPosition(new Date(), 21.4225, 39.8262) // Mecca
-  assert.ok(pos.azimuth >= 0 && pos.azimuth < 360)
-  assert.ok(pos.altitude >= -90 && pos.altitude <= 90)
-  assert.ok(pos.distance > 350000 && pos.distance < 410000)
+  it('azimuth in [0, 360)', () => {
+    assert.ok(moonPos_london.azimuth >= 0 && moonPos_london.azimuth < 360,
+      `azimuth=${moonPos_london.azimuth}`)
+  })
+  it('altitude in [-90, 90]', () => {
+    assert.ok(moonPos_london.altitude >= -90 && moonPos_london.altitude <= 90,
+      `altitude=${moonPos_london.altitude}`)
+  })
+  it('distance in lunar orbit range [356000, 407000] km', () => {
+    assert.ok(moonPos_london.distance >= 356000 && moonPos_london.distance <= 407000,
+      `distance=${moonPos_london.distance.toFixed(0)} km`)
+  })
+  it('finite parallacticAngle', () => {
+    assert.ok(isFinite(moonPos_london.parallacticAngle),
+      `parallacticAngle=${moonPos_london.parallacticAngle}`)
+  })
+  it('default date (now) returns valid result', () => {
+    const pos = getMoonPosition(new Date(), 21.4225, 39.8262)
+    assert.ok(pos.azimuth >= 0 && pos.azimuth < 360)
+    assert.ok(pos.altitude >= -90 && pos.altitude <= 90)
+    assert.ok(pos.distance > 350000 && pos.distance < 410000)
+  })
 })

 // ─── getMoonIllumination ─────────────────────────────────────────────────────

-console.log('\ngetMoonIllumination:')
+describe('getMoonIllumination', () => {
+  const illum_full = getMoonIllumination(new Date('2025-03-14T12:00:00Z'))
+  const illum_new = getMoonIllumination(new Date('2025-03-29T12:00:00Z'))
+  const illum_waxing = getMoonIllumination(new Date('2025-03-05T12:00:00Z'))

-// 2025-03-14 was close to full moon
-const illum_full = getMoonIllumination(new Date('2025-03-14T12:00:00Z'))
-// 2025-03-29 was close to new moon
-const illum_new = getMoonIllumination(new Date('2025-03-29T12:00:00Z'))
-// 2025-03-05 was waxing crescent (~7 days after new moon)
-const illum_waxing = getMoonIllumination(new Date('2025-03-05T12:00:00Z'))
-
-test('getMoonIllumination near full moon: fraction > 0.85', () => {
-  assert.ok(illum_full.fraction > 0.85, `fraction=${illum_full.fraction.toFixed(3)}`)
-})
-test('getMoonIllumination near full moon: phase close to 0.5', () => {
-  assert.ok(
-    illum_full.phase > 0.4 && illum_full.phase < 0.6,
-    `phase=${illum_full.phase.toFixed(3)}`,
-  )
-})
-test('getMoonIllumination near new moon: fraction < 0.05', () => {
-  assert.ok(illum_new.fraction < 0.05, `fraction=${illum_new.fraction.toFixed(3)}`)
-})
-test('getMoonIllumination near new moon: phase close to 0 or 1', () => {
-  const p = illum_new.phase
-  assert.ok(p < 0.08 || p > 0.92, `phase=${p.toFixed(3)}`)
-})
-test('getMoonIllumination waxing: isWaxing = true', () => {
-  assert.equal(illum_waxing.isWaxing, true)
-})
-test('getMoonIllumination fraction in [0, 1]', () => {
-  assert.ok(illum_full.fraction >= 0 && illum_full.fraction <= 1)
-  assert.ok(illum_new.fraction >= 0 && illum_new.fraction <= 1)
-})
-test('getMoonIllumination phase in [0, 1)', () => {
-  assert.ok(illum_full.phase >= 0 && illum_full.phase < 1)
-  assert.ok(illum_new.phase >= 0 && illum_new.phase < 1)
-})
-test('getMoonIllumination angle is finite', () => {
-  assert.ok(isFinite(illum_full.angle), `angle=${illum_full.angle}`)
-})
-test('getMoonIllumination default date (now) returns valid result', () => {
-  const illum = getMoonIllumination()
-  assert.ok(illum.fraction >= 0 && illum.fraction <= 1)
-  assert.ok(illum.phase >= 0 && illum.phase < 1)
-  assert.equal(typeof illum.isWaxing, 'boolean')
-  assert.ok(isFinite(illum.angle))
+  it('near full moon: fraction > 0.85', () => {
+    assert.ok(illum_full.fraction > 0.85, `fraction=${illum_full.fraction.toFixed(3)}`)
+  })
+  it('near full moon: phase close to 0.5', () => {
+    assert.ok(illum_full.phase > 0.4 && illum_full.phase < 0.6,
+      `phase=${illum_full.phase.toFixed(3)}`)
+  })
+  it('near new moon: fraction < 0.05', () => {
+    assert.ok(illum_new.fraction < 0.05, `fraction=${illum_new.fraction.toFixed(3)}`)
+  })
+  it('near new moon: phase close to 0 or 1', () => {
+    const p = illum_new.phase
+    assert.ok(p < 0.08 || p > 0.92, `phase=${p.toFixed(3)}`)
+  })
+  it('waxing: isWaxing = true', () => {
+    assert.equal(illum_waxing.isWaxing, true)
+  })
+  it('fraction in [0, 1]', () => {
+    assert.ok(illum_full.fraction >= 0 && illum_full.fraction <= 1)
+    assert.ok(illum_new.fraction >= 0 && illum_new.fraction <= 1)
+  })
+  it('phase in [0, 1)', () => {
+    assert.ok(illum_full.phase >= 0 && illum_full.phase < 1)
+    assert.ok(illum_new.phase >= 0 && illum_new.phase < 1)
+  })
+  it('angle is finite', () => {
+    assert.ok(isFinite(illum_full.angle), `angle=${illum_full.angle}`)
+  })
+  it('default date (now) returns valid result', () => {
+    const illum = getMoonIllumination()
+    assert.ok(illum.fraction >= 0 && illum.fraction <= 1)
+    assert.ok(illum.phase >= 0 && illum.phase < 1)
+    assert.equal(typeof illum.isWaxing, 'boolean')
+    assert.ok(isFinite(illum.angle))
+  })
 })

 // ─── getMoonPhase phaseName + phaseSymbol ─────────────────────────────────────

-console.log('\ngetMoonPhase — phaseName + phaseSymbol:')
+describe('getMoonPhase phaseName and phaseSymbol', () => {
+  const PHASE_NAMES = new Set([
+    'New Moon', 'Waxing Crescent', 'First Quarter', 'Waxing Gibbous',
+    'Full Moon', 'Waning Gibbous', 'Last Quarter', 'Waning Crescent',
+  ])
+  const PHASE_SYMBOLS = new Set(['🌑', '🌒', '🌓', '🌔', '🌕', '🌖', '🌗', '🌘'])

-const PHASE_NAMES = new Set([
-  'New Moon', 'Waxing Crescent', 'First Quarter', 'Waxing Gibbous',
-  'Full Moon', 'Waning Gibbous', 'Last Quarter', 'Waning Crescent',
-])
-const PHASE_SYMBOLS = new Set(['🌑', '🌒', '🌓', '🌔', '🌕', '🌖', '🌗', '🌘'])
-
-test('getMoonPhase.phaseName is a valid human-readable name', () => {
-  const p = getMoonPhase(DATE_MARCH_1_2025)
-  assert.ok(PHASE_NAMES.has(p.phaseName), `got: ${p.phaseName}`)
-})
-test('getMoonPhase.phaseSymbol is a moon emoji', () => {
-  const p = getMoonPhase(DATE_MARCH_1_2025)
-  assert.ok(PHASE_SYMBOLS.has(p.phaseSymbol), `got: ${p.phaseSymbol}`)
-})
-test('Near full moon: phaseName is "Full Moon" or gibbous', () => {
-  const valid = new Set(['Full Moon', 'Waxing Gibbous', 'Waning Gibbous'])
-  const p = getMoonPhase(DATE_FULL_MOON)
-  assert.ok(valid.has(p.phaseName), `got: ${p.phaseName}`)
-})
-test('Near full moon: phaseSymbol is 🌕 or 🌔 or 🌖', () => {
-  const valid = new Set(['🌕', '🌔', '🌖'])
-  const p = getMoonPhase(DATE_FULL_MOON)
-  assert.ok(valid.has(p.phaseSymbol), `got: ${p.phaseSymbol}`)
-})
-test('Waxing crescent: phaseName is "Waxing Crescent"', () => {
-  const p = getMoonPhase(DATE_WAXING)
-  assert.equal(p.phaseName, 'Waxing Crescent')
-})
-test('Waxing crescent: phaseSymbol is 🌒', () => {
-  const p = getMoonPhase(DATE_WAXING)
-  assert.equal(p.phaseSymbol, '🌒')
-})
-test('phaseName and phaseSymbol are consistent with phase key', () => {
-  // If phase is 'waning-crescent', phaseName should be 'Waning Crescent'
-  const p = getMoonPhase(DATE_WANING)
-  assert.equal(typeof p.phaseName, 'string')
-  assert.ok(p.phaseName.length > 0)
-  assert.ok(PHASE_SYMBOLS.has(p.phaseSymbol))
+  it('phaseName is a valid human-readable name', () => {
+    const p = getMoonPhase(DATE_MARCH_1_2025)
+    assert.ok(PHASE_NAMES.has(p.phaseName), `got: ${p.phaseName}`)
+  })
+  it('phaseSymbol is a moon emoji', () => {
+    const p = getMoonPhase(DATE_MARCH_1_2025)
+    assert.ok(PHASE_SYMBOLS.has(p.phaseSymbol), `got: ${p.phaseSymbol}`)
+  })
+  it('near full moon: phaseName is Full Moon or gibbous', () => {
+    const valid = new Set(['Full Moon', 'Waxing Gibbous', 'Waning Gibbous'])
+    const p = getMoonPhase(new Date('2025-03-14T12:00:00Z'))
+    assert.ok(valid.has(p.phaseName), `got: ${p.phaseName}`)
+  })
+  it('waxing crescent: phaseName is Waxing Crescent', () => {
+    const p = getMoonPhase(new Date('2025-03-05T12:00:00Z'))
+    assert.equal(p.phaseName, 'Waxing Crescent')
+  })
+  it('waxing crescent: phaseSymbol is correct', () => {
+    const p = getMoonPhase(new Date('2025-03-05T12:00:00Z'))
+    assert.equal(p.phaseSymbol, '🌒')
+  })
 })

 // ─── getMoonVisibilityEstimate ─────────────────────────────────────────────────

-console.log('\ngetMoonVisibilityEstimate:')
+describe('getMoonVisibilityEstimate', () => {
+  const DATE_VIS_ESTIMATE = new Date('2025-03-02T18:30:00Z')
+  const vis = getMoonVisibilityEstimate(DATE_VIS_ESTIMATE, 51.5074, -0.1278, 10)

-// London, 40 min after nominal sunset on 2025-03-01 (day after new moon)
-const DATE_VIS_ESTIMATE = new Date('2025-03-02T18:30:00Z')
-const vis = getMoonVisibilityEstimate(DATE_VIS_ESTIMATE, 51.5074, -0.1278, 10)
-
-test('getMoonVisibilityEstimate returns an object', () => {
-  assert.ok(vis !== null && typeof vis === 'object')
-})
-test('getMoonVisibilityEstimate.zone is A, B, C, or D', () => {
-  assert.ok(['A', 'B', 'C', 'D'].includes(vis.zone), `got: ${vis.zone}`)
-})
-test('getMoonVisibilityEstimate.V is finite', () => {
-  assert.ok(isFinite(vis.V), `V=${vis.V}`)
-})
-test('getMoonVisibilityEstimate.ARCL is in [0, 180]', () => {
-  assert.ok(vis.ARCL >= 0 && vis.ARCL <= 180, `ARCL=${vis.ARCL}`)
-})
-test('getMoonVisibilityEstimate.W >= 0', () => {
-  assert.ok(vis.W >= 0, `W=${vis.W}`)
-})
-test('getMoonVisibilityEstimate.isApproximate is true', () => {
-  assert.equal(vis.isApproximate, true)
-})
-test('getMoonVisibilityEstimate.moonAboveHorizon is a boolean', () => {
-  assert.equal(typeof vis.moonAboveHorizon, 'boolean')
-})
-test('getMoonVisibilityEstimate.isVisibleNakedEye matches zone A', () => {
-  assert.equal(vis.isVisibleNakedEye, vis.zone === 'A')
-})
-test('getMoonVisibilityEstimate.isVisibleWithOpticalAid matches zone A or B', () => {
-  assert.equal(vis.isVisibleWithOpticalAid, vis.zone === 'A' || vis.zone === 'B')
-})
-test('getMoonVisibilityEstimate.description is a non-empty string', () => {
-  assert.ok(typeof vis.description === 'string' && vis.description.length > 0)
-})
-test('getMoonVisibilityEstimate default date works', () => {
-  const v = getMoonVisibilityEstimate(new Date(), 21.4225, 39.8262)
-  assert.ok(['A', 'B', 'C', 'D'].includes(v.zone))
-  assert.ok(isFinite(v.V))
-  assert.equal(v.isApproximate, true)
-})
-// Near new moon: elongation small, W small, crescent should be very thin or invisible
-test('Near new moon: zone is D or C (not visible or marginal)', () => {
-  const nearNew = getMoonVisibilityEstimate(new Date('2025-03-29T18:00:00Z'), 21.4225, 39.8262)
-  assert.ok(['C', 'D'].includes(nearNew.zone), `zone=${nearNew.zone} V=${nearNew.V.toFixed(2)}`)
+  it('returns an object', () => {
+    assert.ok(vis !== null && typeof vis === 'object')
+  })
+  it('zone is A, B, C, or D', () => {
+    assert.ok(['A', 'B', 'C', 'D'].includes(vis.zone), `got: ${vis.zone}`)
+  })
+  it('V is finite', () => {
+    assert.ok(isFinite(vis.V), `V=${vis.V}`)
+  })
+  it('ARCL is in [0, 180]', () => {
+    assert.ok(vis.ARCL >= 0 && vis.ARCL <= 180, `ARCL=${vis.ARCL}`)
+  })
+  it('W >= 0', () => {
+    assert.ok(vis.W >= 0, `W=${vis.W}`)
+  })
+  it('isApproximate is true', () => {
+    assert.equal(vis.isApproximate, true)
+  })
+  it('moonAboveHorizon is a boolean', () => {
+    assert.equal(typeof vis.moonAboveHorizon, 'boolean')
+  })
+  it('isVisibleNakedEye matches zone A', () => {
+    assert.equal(vis.isVisibleNakedEye, vis.zone === 'A')
+  })
+  it('isVisibleWithOpticalAid matches zone A or B', () => {
+    assert.equal(vis.isVisibleWithOpticalAid, vis.zone === 'A' || vis.zone === 'B')
+  })
+  it('description is a non-empty string', () => {
+    assert.ok(typeof vis.description === 'string' && vis.description.length > 0)
+  })
+  it('default date works', () => {
+    const v = getMoonVisibilityEstimate(new Date(), 21.4225, 39.8262)
+    assert.ok(['A', 'B', 'C', 'D'].includes(v.zone))
+    assert.ok(isFinite(v.V))
+    assert.equal(v.isApproximate, true)
+  })
+  it('near new moon: zone is D or C', () => {
+    const nearNew = getMoonVisibilityEstimate(new Date('2025-03-29T18:00:00Z'), 21.4225, 39.8262)
+    assert.ok(['C', 'D'].includes(nearNew.zone), `zone=${nearNew.zone} V=${nearNew.V.toFixed(2)}`)
+  })
 })

 // ─── getMoon ──────────────────────────────────────────────────────────────────

-console.log('\ngetMoon:')
+describe('getMoon', () => {
+  const moon = getMoon(new Date('2025-03-05T20:00:00Z'), 51.5074, -0.1278, 10)

-const moon = getMoon(new Date('2025-03-05T20:00:00Z'), 51.5074, -0.1278, 10)
-
-test('getMoon returns an object with phase, position, illumination, visibility', () => {
-  assert.ok(typeof moon === 'object')
-  assert.ok(typeof moon.phase === 'object')
-  assert.ok(typeof moon.position === 'object')
-  assert.ok(typeof moon.illumination === 'object')
-  assert.ok(typeof moon.visibility === 'object')
-})
-test('getMoon.phase is consistent with getMoonPhase standalone', () => {
-  const standalone = getMoonPhase(new Date('2025-03-05T20:00:00Z'))
-  assert.equal(moon.phase.phase, standalone.phase)
-  assert.equal(moon.phase.phaseName, standalone.phaseName)
-})
-test('getMoon.illumination.isWaxing matches phase.isWaxing', () => {
-  assert.equal(moon.illumination.isWaxing, moon.phase.isWaxing)
-})
-test('getMoon.visibility.isApproximate is true', () => {
-  assert.equal(moon.visibility.isApproximate, true)
-})
-test('getMoon.position has valid azimuth and altitude', () => {
-  assert.ok(moon.position.azimuth >= 0 && moon.position.azimuth < 360)
-  assert.ok(moon.position.altitude >= -90 && moon.position.altitude <= 90)
-})
-test('getMoon default date works', () => {
-  const m = getMoon(new Date(), 21.4225, 39.8262)
-  assert.ok(PHASE_NAMES.has(m.phase.phaseName))
-  assert.ok(isFinite(m.position.azimuth))
-  assert.ok(isFinite(m.illumination.fraction))
-  assert.ok(['A', 'B', 'C', 'D'].includes(m.visibility.zone))
+  it('returns object with phase, position, illumination, visibility', () => {
+    assert.ok(typeof moon === 'object')
+    assert.ok(typeof moon.phase === 'object')
+    assert.ok(typeof moon.position === 'object')
+    assert.ok(typeof moon.illumination === 'object')
+    assert.ok(typeof moon.visibility === 'object')
+  })
+  it('phase is consistent with getMoonPhase standalone', () => {
+    const standalone = getMoonPhase(new Date('2025-03-05T20:00:00Z'))
+    assert.equal(moon.phase.phase, standalone.phase)
+    assert.equal(moon.phase.phaseName, standalone.phaseName)
+  })
+  it('illumination.isWaxing matches phase.isWaxing', () => {
+    assert.equal(moon.illumination.isWaxing, moon.phase.isWaxing)
+  })
+  it('visibility.isApproximate is true', () => {
+    assert.equal(moon.visibility.isApproximate, true)
+  })
+  it('position has valid azimuth and altitude', () => {
+    assert.ok(moon.position.azimuth >= 0 && moon.position.azimuth < 360)
+    assert.ok(moon.position.altitude >= -90 && moon.position.altitude <= 90)
+  })
+  it('default date works', () => {
+    const m = getMoon(new Date(), 21.4225, 39.8262)
+    assert.ok(isFinite(m.position.azimuth))
+    assert.ok(isFinite(m.illumination.fraction))
+    assert.ok(['A', 'B', 'C', 'D'].includes(m.visibility.zone))
+  })
 })

-// ─── Summary ─────────────────────────────────────────────────────────────────
+// ─── Input validation ─────────────────────────────────────────────────────────

-console.log(`\n${passed + failed} tests: ${passed} passed, ${failed} failed`)
-
-if (failed > 0) {
-  process.exit(1)
-}
+describe('Input validation', () => {
+  it('getMoonPhase rejects invalid date', () => {
+    assert.throws(() => getMoonPhase(new Date('invalid')), /valid Date/)
+  })
+  it('getMoonPosition rejects latitude out of range', () => {
+    assert.throws(() => getMoonPosition(new Date(), 91, 0), /latitude/)
+  })
+  it('getMoonPosition rejects longitude out of range', () => {
+    assert.throws(() => getMoonPosition(new Date(), 0, 181), /longitude/)
+  })
+  it('getMoonPosition rejects NaN latitude', () => {
+    assert.throws(() => getMoonPosition(new Date(), NaN, 0), /latitude/)
+  })
+  it('getMoonVisibilityEstimate rejects invalid coordinates', () => {
+    assert.throws(() => getMoonVisibilityEstimate(new Date(), -91, 0), /latitude/)
+  })
+  it('getMoon rejects invalid coordinates', () => {
+    assert.throws(() => getMoon(new Date(), 0, 200), /longitude/)
+  })
+})
--- a/tsconfig.json
+++ b/tsconfig.json
@ -4,6 +4,9 @@
    "module": "ESNext",
    "moduleResolution": "bundler",
    "strict": true,
+    "noImplicitReturns": true,
+    "noFallthroughCasesInSwitch": true,
+    "skipLibCheck": true,
    "forceConsistentCasingInFileNames": true,
    "esModuleInterop": true,
    "declaration": true,