refactor: code quality improvements across the board

- Extract magic numbers into named constants (DHUHR_OFFSET_MINUTES, ANGLE_MIN/MAX, LAT_SCALE) with source citations for MCW coefficients - Add input validation (RangeError) for lat, lng, tz, elevation on all public API functions (getTimes, getTimesAll) - Optimize solar ephemeris: computeAngles() returns declination so getTimes/getTimesAll reuse it for Asr instead of computing twice - DRY: shared constants.ts for DEG, Dhuhr offset, angle bounds - Improve MethodEntry type with labeled tuple elements and NaN docs - Add stricter tsconfig (noImplicitReturns, noFallthroughCasesInSwitch) - Switch tests to node:test framework (TAP output, describe/it blocks) - Add 8 new input validation tests (104 ESM + 13 CJS total) - Add ESLint + Prettier with CI lint job - Remove src/ from npm package files (smaller published tarball) - Document NaN return behavior in JSDoc for getTimes/getTimesAll
2026-06-30 19:04:26 +00:00 · 2026-03-08 13:45:29 +00:00 · 2026-03-08 13:45:29 +00:00 · 8f39fcd82e
commit 8f39fcd82e
parent a8d15bc85d
21 changed files with 1759 additions and 830 deletions
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@ -24,8 +24,24 @@ jobs:
          cache: pnpm
      - 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 & Format
+    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: Typecheck
--- a/.gitignore
+++ b/.gitignore
@ -56,3 +56,9 @@ coverage/
 .windsurf/
 .cody/
 .sourcegraph/
+.vscode/*
+.codex/
+.aider/
+.aider.chat.history.md
+.continue/
+.gemini/
--- a/.prettierrc
+++ b/.prettierrc
@ -0,0 +1,6 @@
+{
+  "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 eslintConfigPrettier from 'eslint-config-prettier';
+
+export default tseslint.config(
+  eslint.configs.recommended,
+  ...tseslint.configs.recommended,
+  eslintConfigPrettier,
+  {
+    ignores: ['dist/', 'node_modules/', 'test.mjs', 'test-cjs.cjs'],
+  },
+);
--- a/package.json
+++ b/package.json
@ -22,7 +22,6 @@
  "sideEffects": false,
  "files": [
    "dist/",
-    "src/",
    "README.md",
    "CHANGELOG.md",
    "LICENSE"
@ -31,7 +30,10 @@
    "build": "tsup",
    "typecheck": "tsc --noEmit",
    "pretest": "tsup",
-    "test": "node test.mjs && node test-cjs.cjs",
+    "test": "node --test test.mjs && node --test test-cjs.cjs",
+    "lint": "eslint src/",
+    "format": "prettier --write src/",
+    "format:check": "prettier --check src/",
    "prepublishOnly": "tsup"
  },
  "keywords": [
@ -72,8 +74,13 @@
    "nrel-spa": "^2.0.1"
  },
  "devDependencies": {
+    "@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": "^5.9.3",
+    "typescript-eslint": "^8.56.1"
  }
 }
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@ -12,15 +12,30 @@ importers:
        specifier: ^2.0.1
        version: 2.0.1
    devDependencies:
+      '@eslint/js':
+        specifier: ^10.0.1
+        version: 10.0.1(eslint@10.0.3)
      '@types/node':
        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: ^8.5.1
        version: 8.5.1(typescript@5.9.3)
      typescript:
        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:

@ -180,6 +195,61 @@ 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==}
+    engines: {node: ^12.0.0 || ^14.0.0 || >=16.0.0}
+
+  '@eslint/config-array@0.23.3':
+    resolution: {integrity: sha512-j+eEWmB6YYLwcNOdlwQ6L2OsptI/LO6lNBuLIqe5R7RetD658HLoF+Mn7LzYmAWWNNzdC6cqP+L6r8ujeYXWLw==}
+    engines: {node: ^20.19.0 || ^22.13.0 || >=24}
+
+  '@eslint/config-helpers@0.5.3':
+    resolution: {integrity: sha512-lzGN0onllOZCGroKJmRwY6QcEHxbjBw1gwB8SgRSqK8YbbtEXMvKynsXc3553ckIEBxsbMBU7oOZXKIPGZNeZw==}
+    engines: {node: ^20.19.0 || ^22.13.0 || >=24}
+
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+    engines: {node: ^20.19.0 || ^22.13.0 || >=24}
+
+  '@eslint/js@10.0.1':
+    resolution: {integrity: sha512-zeR9k5pd4gxjZ0abRoIaxdc7I3nDktoXZk2qOv9gCNWx3mVwEn32VRhyLaRsDiJjTs0xq/T8mfPtyuXu7GWBcA==}
+    engines: {node: ^20.19.0 || ^22.13.0 || >=24}
+    peerDependencies:
+      eslint: ^10.0.0
+    peerDependenciesMeta:
+      eslint:
+        optional: true
+
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+    resolution: {integrity: sha512-iM869Pugn9Nsxbh/YHRqYiqd23AmIbxJOcpUMOuWCVNdoQJ5ZtwL6h3t0bcZzJUlC3Dq9jCFCESBZnX0GTv7iQ==}
+    engines: {node: ^20.19.0 || ^22.13.0 || >=24}
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+    engines: {node: ^20.19.0 || ^22.13.0 || >=24}
+
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+    engines: {node: '>=18.18.0'}
+
+  '@humanwhocodes/module-importer@1.0.1':
+    resolution: {integrity: sha512-bxveV4V8v5Yb4ncFTT3rPSgZBOpCkjfK0y4oVVVJwIuDVBRMDXrPyXRL988i5ap9m9bnyEEjWfm5WkBmtffLfA==}
+    engines: {node: '>=12.22'}
+
+  '@humanwhocodes/retry@0.4.3':
+    resolution: {integrity: sha512-bV0Tgo9K4hfPCek+aMAn81RppFKv2ySDQeMoSZuvTASywNTnVJCArCZE2FWqpvIatKu7VMRLWlR1EazvVhDyhQ==}
+    engines: {node: '>=18.18'}
+
  '@jridgewell/gen-mapping@0.3.13':
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@ -331,20 +401,101 @@ packages:
    cpu: [x64]
    os: [win32]

+  '@types/esrecurse@4.3.1':
+    resolution: {integrity: sha512-xJBAbDifo5hpffDBuHl0Y8ywswbiAp/Wi7Y/GtAgSlZyIABppyurxVueOPE8LUQOxdlgi6Zqce7uoEpqNTeiUw==}
+
  '@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==}
+    engines: {node: ^18.18.0 || ^20.9.0 || >=21.1.0}
+    peerDependencies:
+      '@typescript-eslint/parser': ^8.56.1
+      eslint: ^8.57.0 || ^9.0.0 || ^10.0.0
+      typescript: '>=4.8.4 <6.0.0'
+
+  '@typescript-eslint/parser@8.56.1':
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+      eslint: ^8.57.0 || ^9.0.0 || ^10.0.0
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+    engines: {node: ^18.18.0 || ^20.9.0 || >=21.1.0}
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+  '@typescript-eslint/tsconfig-utils@8.56.1':
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+    engines: {node: ^18.18.0 || ^20.9.0 || >=21.1.0}
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+    engines: {node: ^18.18.0 || ^20.9.0 || >=21.1.0}
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+  '@typescript-eslint/typescript-estree@8.56.1':
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+    engines: {node: ^18.18.0 || ^20.9.0 || >=21.1.0}
+    peerDependencies:
+      typescript: '>=4.8.4 <6.0.0'
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+    resolution: {integrity: sha512-HPAVNIME3tABJ61siYlHzSWCGtOoeP2RTIaHXFMPqjrQKCGB9OgUVdiNgH7TJS2JNIQ5qQ4RsAUDuGaGme/KOA==}
+    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'
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+    engines: {node: ^18.18.0 || ^20.9.0 || >=21.1.0}
+
+  acorn-jsx@5.3.2:
+    resolution: {integrity: sha512-rq9s+JNhf0IChjtDXxllJ7g41oZk5SlXtp0LHwyA5cejwn7vKmKp4pPri6YEePv2PU65sAsegbXtIinmDFDXgQ==}
+    peerDependencies:
+      acorn: ^6.0.0 || ^7.0.0 || ^8.0.0
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  acorn@8.16.0:
    resolution: {integrity: sha512-UVJyE9MttOsBQIDKw1skb9nAwQuR5wuGD3+82K6JgJlm/Y+KI92oNsMNGZCYdDsVtRHSak0pcV5Dno5+4jh9sw==}
    engines: {node: '>=0.4.0'}
    hasBin: true

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+
  any-promise@1.3.0:
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+    engines: {node: 18 || 20 || >=22}
+
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+    engines: {node: 18 || 20 || >=22}
+
  bundle-require@5.1.0:
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@ -370,6 +521,10 @@ packages:
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    engines: {node: ^14.18.0 || >=16.10.0}

+  cross-spawn@7.0.6:
+    resolution: {integrity: sha512-uV2QOWP2nWzsy2aMp8aRibhi9dlzF5Hgh5SHaB9OiTGEyDTiJJyx0uy51QXdyWbtAHNua4XJzUKca3OzKUd3vA==}
+    engines: {node: '>= 8'}
+
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    engines: {node: '>=6.0'}
@ -379,11 +534,75 @@ packages:
      supports-color:
        optional: true

+  deep-is@0.1.4:
+    resolution: {integrity: sha512-oIPzksmTg4/MriiaYGO+okXDT7ztn/w3Eptv/+gSIdMdKsJo0u4CfYNFJPy+4SKMuCqGw2wxnA+URMg3t8a/bQ==}
+
  esbuild@0.27.3:
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    engines: {node: '>=18'}
    hasBin: true

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+    engines: {node: '>=10'}
+
+  eslint-config-prettier@10.1.8:
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+    peerDependencies:
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+    engines: {node: ^20.19.0 || ^22.13.0 || >=24}
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+  eslint-visitor-keys@3.4.3:
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+    engines: {node: ^12.22.0 || ^14.17.0 || >=16.0.0}
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+    hasBin: true
+    peerDependencies:
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+    peerDependenciesMeta:
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+        optional: true
+
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+
+  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'}
@ -393,18 +612,76 @@ 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'}
@ -416,9 +693,17 @@ 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==}

@ -428,6 +713,9 @@ packages:
  mz@2.7.0:
    resolution: {integrity: sha512-z81GNO7nnYMEhrGh9LeymoE4+Yr0Wn5McHIZMK5cfQCl+NDX08sCZgUc9/6MHni9IWuFLm1Z3HTCXu2z9fN62Q==}

+  natural-compare@1.4.0:
+    resolution: {integrity: sha512-OWND8ei3VtNC9h7V60qff3SVobHr996CTwgxubgyQYEpg290h9J0buyECNNJexkFm5sOajh5G116RYA1c8ZMSw==}
+
  nrel-spa@2.0.1:
    resolution: {integrity: sha512-KwsudVfAHMUwz9RwhriI7oNqFYz77+VGi2vUpJeR+xNx57MU28EYcdt1TQ1frEDbpBXkF4EJxM62Hi2iX6QNCA==}
    engines: {node: '>=20'}
@ -436,6 +724,26 @@ packages:
    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==}

@ -471,6 +779,19 @@ 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'}
@ -484,6 +805,19 @@ 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'}
@ -511,6 +845,12 @@ 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==}

@ -533,6 +873,17 @@ 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'}
@ -544,6 +895,22 @@ 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':
@ -624,6 +991,51 @@ 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
@ -713,16 +1125,128 @@ 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
@ -740,10 +1264,18 @@ 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
@ -773,31 +1305,164 @@ 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
@ -813,10 +1478,33 @@ snapshots:
      object-assign: 4.1.1
      thenify-all: 1.6.0

+  natural-compare@1.4.0: {}
+
  nrel-spa@2.0.1: {}

  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: {}
@ -835,6 +1523,12 @@ 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: {}
@ -870,6 +1564,14 @@ 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:
@ -899,6 +1601,10 @@ 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):
@ -928,8 +1634,35 @@ 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/constants.ts
+++ b/src/constants.ts
@ -0,0 +1,35 @@
+/**
+ * Shared constants for pray-calc.
+ */
+
+/** Degrees-to-radians conversion factor. */
+export const DEG = Math.PI / 180;
+
+/**
+ * Minutes added to solar noon to obtain Dhuhr time.
+ *
+ * Standard practice adds a small buffer after geometric solar transit to
+ * ensure the sun has clearly passed the meridian before Dhuhr begins.
+ * The 2.5-minute convention is widely used across Islamic timekeeping
+ * authorities and accounts for the sun's angular diameter (~0.5°) plus
+ * a small safety margin.
+ */
+export const DHUHR_OFFSET_MINUTES = 2.5;
+
+/**
+ * Minimum allowed dynamic twilight depression angle (degrees).
+ *
+ * At very high latitudes in summer the MCW base angle can drop below
+ * physically meaningful values. 10° is the lower clamp — below this
+ * the sky is too bright for any twilight definition.
+ */
+export const ANGLE_MIN = 10;
+
+/**
+ * Maximum allowed dynamic twilight depression angle (degrees).
+ *
+ * 22° is the upper clamp. Values above ~20° correspond to deep
+ * astronomical twilight where the sky is indistinguishable from full
+ * night. No standard method exceeds 20° for Fajr.
+ */
+export const ANGLE_MAX = 22;
--- a/src/getAngles.ts
+++ b/src/getAngles.ts
@ -52,13 +52,14 @@

 import { toJulianDate, solarEphemeris, atmosphericRefraction } from './getSolarEphemeris.js';
 import { getMscFajr, getMscIsha, minutesToDepression } from './getMSC.js';
+import { DEG, ANGLE_MIN, ANGLE_MAX } from './constants.js';
 import type { TwilightAngles } from './types.js';

-const DEG = Math.PI / 180;
-const FAJR_MIN = 10;
-const FAJR_MAX = 22;
-const ISHA_MIN = 10;
-const ISHA_MAX = 22;
+/** Internal result type including ephemeris data for caller reuse. */
+export interface AnglesWithEphemeris extends TwilightAngles {
+  /** Solar declination in degrees (reusable for Asr computation). */
+  decl: number;
+}

 /** Clamp a value to [min, max]. */
 function clip(value: number, min: number, max: number): number {
@ -108,10 +109,7 @@ function earthSunDistanceCorrection(r: number): number {
 *
 * Net effect is small (< 0.3°) and primarily improves day-to-day smoothness.
 */
-function fourierSmoothingCorrection(
-  eclLon: number,
-  latAbsDeg: number,
-): number {
+function fourierSmoothingCorrection(eclLon: number, latAbsDeg: number): number {
  const theta = eclLon; // solar ecliptic longitude, radians [0, 2π)
  const phi = latAbsDeg * DEG;

@ -133,27 +131,23 @@ function fourierSmoothingCorrection(
 }

 /**
- * Compute dynamic twilight depression angles for Fajr and Isha.
+ * Internal: compute angles and return solar declination for Asr reuse.
 *
- * @param date        - Observer's local date (time-of-day is ignored)
- * @param lat         - Latitude in decimal degrees
- * @param lng         - Longitude in decimal degrees (currently unused; reserved)
- * @param elevation   - Observer elevation in meters (default: 0)
- * @param temperature - Ambient temperature in °C (default: 15)
- * @param pressure    - Atmospheric pressure in mbar (default: 1013.25)
- * @returns Fajr and Isha depression angles in degrees
+ * This avoids recomputing solarEphemeris in getTimes/getTimesAll.
 */
-export function getAngles(
+export function computeAngles(
  date: Date,
  lat: number,
  lng: number,
  elevation = 0,
  temperature = 15,
  pressure = 1013.25,
-): TwilightAngles {
+): AnglesWithEphemeris {
  // 1. Solar ephemeris features at solar noon of the given date.
  //    Using UTC noon as a stable reference that avoids timezone artifacts.
-  const noonDate = new Date(Date.UTC(date.getFullYear(), date.getMonth(), date.getDate(), 12, 0, 0));
+  const noonDate = new Date(
+    Date.UTC(date.getFullYear(), date.getMonth(), date.getDate(), 12, 0, 0),
+  );
  const jd = toJulianDate(noonDate);
  const { decl, r, eclLon } = solarEphemeris(jd);

@ -202,8 +196,31 @@ export function getAngles(
  const rawFajr = fajrBase + rCorr + fourierCorr + refrFajr + elevCorr;
  const rawIsha = ishaBase + rCorr + fourierCorr + refrIsha + elevCorr;

-  const fajrAngle = round3(clip(rawFajr, FAJR_MIN, FAJR_MAX));
-  const ishaAngle = round3(clip(rawIsha, ISHA_MIN, ISHA_MAX));
+  const fajrAngle = round3(clip(rawFajr, ANGLE_MIN, ANGLE_MAX));
+  const ishaAngle = round3(clip(rawIsha, ANGLE_MIN, ANGLE_MAX));

+  return { fajrAngle, ishaAngle, decl };
+}
+
+/**
+ * Compute dynamic twilight depression angles for Fajr and Isha.
+ *
+ * @param date        - Observer's local date (time-of-day is ignored)
+ * @param lat         - Latitude in decimal degrees (-90 to 90)
+ * @param lng         - Longitude in decimal degrees (-180 to 180, currently unused; reserved)
+ * @param elevation   - Observer elevation in meters (default: 0)
+ * @param temperature - Ambient temperature in °C (default: 15)
+ * @param pressure    - Atmospheric pressure in mbar (default: 1013.25)
+ * @returns Fajr and Isha depression angles in degrees
+ */
+export function getAngles(
+  date: Date,
+  lat: number,
+  lng: number,
+  elevation = 0,
+  temperature = 15,
+  pressure = 1013.25,
+): TwilightAngles {
+  const { fajrAngle, ishaAngle } = computeAngles(date, lat, lng, elevation, temperature, pressure);
  return { fajrAngle, ishaAngle };
 }
--- a/src/getAsr.ts
+++ b/src/getAsr.ts
@ -7,7 +7,7 @@
 * and solar noon are known.
 */

-const DEG = Math.PI / 180;
+import { DEG } from './constants.js';

 /**
 * Compute Asr time as fractional hours.
@ -36,9 +36,7 @@ export function getAsr(

  // Solve the hour-angle equation:
  // cos(H0) = (sin(A) − sin(φ)sin(δ)) / (cos(φ)cos(δ))
-  const cosH0 =
-    (sinA - Math.sin(phi) * Math.sin(delta)) /
-    (Math.cos(phi) * Math.cos(delta));
+  const cosH0 = (sinA - Math.sin(phi) * Math.sin(delta)) / (Math.cos(phi) * Math.cos(delta));

  if (cosH0 < -1 || cosH0 > 1) return NaN; // sun never reaches A

--- a/src/getMSC.ts
+++ b/src/getMSC.ts
@ -9,11 +9,29 @@
 *
 * Reference: moonsighting.com/isha_fajr.html
 *
+ * ## MCW Coefficient Key
+ *
+ * The piecewise-linear anchor values (a, b, c, d) follow the pattern:
+ *   value = BASE + (SLOPE / LAT_SCALE) × |latitude|
+ *
+ * where BASE is the equatorial offset in minutes, SLOPE is the per-degree
+ * latitude coefficient, and LAT_SCALE = 55° is the normalisation latitude.
+ * Coefficients were curve-fit to multi-latitude observations of Subh Sadiq
+ * and Shafaq by the Moonsighting Committee (moonsighting.com/isha_fajr.html).
+ *
 * High-latitude handling (|lat| > 55°): falls back to 1/7-night rule.
 */

 export type ShafaqMode = 'general' | 'ahmer' | 'abyad';

+/**
+ * Normalisation latitude (degrees) used as the divisor in MCW latitude
+ * scaling coefficients. All MCW slope values are expressed per 55° of
+ * latitude so that the piecewise function smoothly scales from equator
+ * to mid-high latitudes.
+ */
+const LAT_SCALE = 55;
+
 function isLeapYear(year: number): boolean {
  return (year % 4 === 0 && year % 100 !== 0) || year % 400 === 0;
 }
@ -79,10 +97,12 @@ export function getMscFajr(date: Date, latitude: number): number {
  const latAbs = Math.abs(latitude);
  const { dyy, daysInYear } = computeDyy(date, latitude);

-  const a = 75 + (28.65 / 55) * latAbs;
-  const b = 75 + (19.44 / 55) * latAbs;
-  const c = 75 + (32.74 / 55) * latAbs;
-  const d = 75 + (48.1 / 55) * latAbs;
+  // Anchor values: BASE + (SLOPE / LAT_SCALE) × |lat|
+  // BASE = 75 min (equatorial Fajr offset). Slopes from MCW curve-fit.
+  const a = 75 + (28.65 / LAT_SCALE) * latAbs;
+  const b = 75 + (19.44 / LAT_SCALE) * latAbs;
+  const c = 75 + (32.74 / LAT_SCALE) * latAbs;
+  const d = 75 + (48.1 / LAT_SCALE) * latAbs;

  return Math.round(interpolateSegment(dyy, daysInYear, a, b, c, d));
 }
@ -95,11 +115,7 @@ export function getMscFajr(date: Date, latitude: number): number {
 * - 'ahmer': based on disappearance of redness (shafaq ahmer)
 * - 'abyad': based on disappearance of whiteness (shafaq abyad), later
 */
-export function getMscIsha(
-  date: Date,
-  latitude: number,
-  shafaq: ShafaqMode = 'general',
-): number {
+export function getMscIsha(date: Date, latitude: number, shafaq: ShafaqMode = 'general'): number {
  const latAbs = Math.abs(latitude);
  const { dyy, daysInYear } = computeDyy(date, latitude);

@ -107,22 +123,25 @@ export function getMscIsha(

  switch (shafaq) {
    case 'ahmer':
-      a = 62 + (17.4 / 55) * latAbs;
-      b = 62 - (7.16 / 55) * latAbs;
-      c = 62 + (5.12 / 55) * latAbs;
-      d = 62 + (19.44 / 55) * latAbs;
+      // Shafaq ahmer (red glow): BASE = 62 min (shorter twilight)
+      a = 62 + (17.4 / LAT_SCALE) * latAbs;
+      b = 62 - (7.16 / LAT_SCALE) * latAbs;
+      c = 62 + (5.12 / LAT_SCALE) * latAbs;
+      d = 62 + (19.44 / LAT_SCALE) * latAbs;
      break;
    case 'abyad':
-      a = 75 + (25.6 / 55) * latAbs;
-      b = 75 + (7.16 / 55) * latAbs;
-      c = 75 + (36.84 / 55) * latAbs;
-      d = 75 + (81.84 / 55) * latAbs;
+      // Shafaq abyad (white glow): BASE = 75 min (longer twilight)
+      a = 75 + (25.6 / LAT_SCALE) * latAbs;
+      b = 75 + (7.16 / LAT_SCALE) * latAbs;
+      c = 75 + (36.84 / LAT_SCALE) * latAbs;
+      d = 75 + (81.84 / LAT_SCALE) * latAbs;
      break;
    default: // 'general'
-      a = 75 + (25.6 / 55) * latAbs;
-      b = 75 + (2.05 / 55) * latAbs;
-      c = 75 - (9.21 / 55) * latAbs;
-      d = 75 + (6.14 / 55) * latAbs;
+      // General (blended) mode: BASE = 75 min
+      a = 75 + (25.6 / LAT_SCALE) * latAbs;
+      b = 75 + (2.05 / LAT_SCALE) * latAbs;
+      c = 75 - (9.21 / LAT_SCALE) * latAbs;
+      d = 75 + (6.14 / LAT_SCALE) * latAbs;
  }

  return Math.round(interpolateSegment(dyy, daysInYear, a, b, c, d));
@ -138,11 +157,7 @@ export function getMscIsha(
 *
 * Returns NaN if the geometry is unreachable (polar day/night).
 */
-export function minutesToDepression(
-  minutes: number,
-  latDeg: number,
-  declDeg: number,
-): number {
+export function minutesToDepression(minutes: number, latDeg: number, declDeg: number): number {
  const phi = latDeg * (Math.PI / 180);
  const delta = declDeg * (Math.PI / 180);

@ -179,8 +194,7 @@ export function minutesToDepression(
  }

  // Solar altitude at H_prayer
-  const sinH_prayer =
-    sinPhi * sinDelta + cosPhi * cosDelta * Math.cos(H_prayer);
+  const sinH_prayer = sinPhi * sinDelta + cosPhi * cosDelta * Math.cos(H_prayer);
  const h_prayer = Math.asin(Math.max(-1, Math.min(1, sinH_prayer)));

  // Depression angle: positive when sun is below horizon
--- a/src/getSolarEphemeris.ts
+++ b/src/getSolarEphemeris.ts
@ -8,7 +8,7 @@
 * prayer time solving still uses the full SPA via nrel-spa.
 */

-const DEG = Math.PI / 180;
+import { DEG } from './constants.js';

 /** Julian Date from a JavaScript Date (UTC). */
 export function toJulianDate(date: Date): number {
@ -32,10 +32,10 @@ export function solarEphemeris(jd: number): SolarEphemeris {
  const T = (jd - 2451545.0) / 36525.0;

  // Geometric mean longitude L0 (degrees)
-  const L0 = ((280.46646 + 36000.76983 * T + 0.0003032 * T * T) % 360 + 360) % 360;
+  const L0 = (((280.46646 + 36000.76983 * T + 0.0003032 * T * T) % 360) + 360) % 360;

  // Mean anomaly M (degrees)
-  const M = ((357.52911 + 35999.05029 * T - 0.0001537 * T * T) % 360 + 360) % 360;
+  const M = (((357.52911 + 35999.05029 * T - 0.0001537 * T * T) % 360) + 360) % 360;
  const Mrad = M * DEG;

  // Orbital eccentricity
@ -58,7 +58,7 @@ export function solarEphemeris(jd: number): SolarEphemeris {
  const r = (1.000001018 * (1 - e * e)) / (1 + e * Math.cos(nuRad));

  // Longitude of ascending node of Moon's orbit (for nutation)
-  const Omega = ((125.04 - 1934.136 * T) % 360 + 360) % 360;
+  const Omega = (((125.04 - 1934.136 * T) % 360) + 360) % 360;
  const OmegaRad = Omega * DEG;

  // Apparent solar longitude corrected for nutation and aberration
@ -66,11 +66,7 @@ export function solarEphemeris(jd: number): SolarEphemeris {
  const lambdaRad = lambda * DEG;

  // Mean obliquity of the ecliptic (degrees)
-  const epsilon0 =
-    23.439291 -
-    0.013004 * T -
-    1.638e-7 * T * T +
-    5.036e-7 * T * T * T;
+  const epsilon0 = 23.439291 - 0.013004 * T - 1.638e-7 * T * T + 5.036e-7 * T * T * T;

  // True obliquity with nutation correction
  const epsilon = (epsilon0 + 0.00256 * Math.cos(OmegaRad)) * DEG;
@ -92,11 +88,7 @@ export function solarEphemeris(jd: number): SolarEphemeris {
 *
 * Formula: dh/dt ≈ 15 × cos(φ) × cos(δ) × sin(H) [°/hr]
 */
-export function solarVerticalSpeed(
-  latRad: number,
-  declRad: number,
-  hAngleRad: number,
-): number {
+export function solarVerticalSpeed(latRad: number, declRad: number, hAngleRad: number): number {
  return 15 * Math.abs(Math.cos(latRad) * Math.cos(declRad) * Math.sin(hAngleRad));
 }

--- a/src/getTimes.ts
+++ b/src/getTimes.ts
@ -7,26 +7,33 @@
 */

 import { getSpa } from 'nrel-spa';
-import { toJulianDate, solarEphemeris } from './getSolarEphemeris.js';
-import { getAngles } from './getAngles.js';
+import { computeAngles } from './getAngles.js';
 import { getAsr } from './getAsr.js';
 import { getQiyam } from './getQiyam.js';
+import { validateInputs } from './validate.js';
+import { DHUHR_OFFSET_MINUTES } from './constants.js';
 import type { PrayerTimes } from './types.js';

 /**
 * Compute prayer times for a given date and location.
 *
+ * Uses the dynamic twilight angle algorithm to determine Fajr and Isha
+ * depression angles, then solves for all prayer events via SPA.
+ *
 * @param date        - Observer's local date (time-of-day is ignored)
- * @param lat         - Latitude in decimal degrees (−90 to 90, south = negative)
- * @param lng         - Longitude in decimal degrees (−180 to 180, west = negative)
- * @param tz          - UTC offset in hours (e.g. −5 for EST). Defaults to the
+ * @param lat         - Latitude in decimal degrees (-90 to 90, south = negative)
+ * @param lng         - Longitude in decimal degrees (-180 to 180, west = negative)
+ * @param tz          - UTC offset in hours (e.g. -5 for EST). Defaults to the
 *                      system timezone derived from the Date object.
 * @param elevation   - Observer elevation in meters (default: 0)
 * @param temperature - Ambient temperature in °C (default: 15)
 * @param pressure    - Atmospheric pressure in mbar/hPa (default: 1013.25)
 * @param hanafi      - Asr convention: false = Shafi'i/Maliki/Hanbali (default),
 *                      true = Hanafi
- * @returns Prayer times as fractional hours and the dynamic angles used
+ * @returns Prayer times as fractional hours and the dynamic angles used.
+ *          Any time that cannot be computed (e.g. polar night/day, or the
+ *          sun never reaching the required depression) is returned as `NaN`.
+ * @throws {RangeError} if lat, lng, tz, or elevation are out of valid range
 */
 export function getTimes(
  date: Date,
@ -38,8 +45,17 @@ export function getTimes(
  pressure = 1013.25,
  hanafi = false,
 ): PrayerTimes {
-  // 1. Compute dynamic twilight angles.
-  const { fajrAngle, ishaAngle } = getAngles(date, lat, lng, elevation, temperature, pressure);
+  validateInputs(lat, lng, tz, elevation);
+
+  // 1. Compute dynamic twilight angles and reuse solar declination.
+  const { fajrAngle, ishaAngle, decl } = computeAngles(
+    date,
+    lat,
+    lng,
+    elevation,
+    temperature,
+    pressure,
+  );

  // 2. Convert depression angles to SPA zenith angles.
  //    SPA uses zenith angle (90° + depression) for custom altitude events.
@ -56,19 +72,13 @@ export function getTimes(
  const maghribTime = spaData.sunset;
  const ishaTime = spaData.angles[1].sunset;

-  // Dhuhr: 2.5 minutes after solar noon (standard practice to confirm transit).
-  const dhuhrTime = noonTime + 2.5 / 60;
+  // Dhuhr: offset after solar noon (standard practice to confirm transit).
+  const dhuhrTime = noonTime + DHUHR_OFFSET_MINUTES / 60;

-  // 4. Solar declination for Asr (Meeus formula, accurate to ~0.01°).
-  const jd = toJulianDate(
-    new Date(Date.UTC(date.getFullYear(), date.getMonth(), date.getDate(), 12, 0, 0)),
-  );
-  const { decl } = solarEphemeris(jd);
-
-  // 5. Asr time.
+  // 4. Asr time (reuses declination from computeAngles — no extra ephemeris call).
  const asrTime = getAsr(noonTime, lat, decl, hanafi);

-  // 6. Qiyam al-Layl (last third of the night).
+  // 5. Qiyam al-Layl (last third of the night).
  const qiyamTime = getQiyam(fajrTime, ishaTime);

  return {
--- a/src/getTimesAll.ts
+++ b/src/getTimesAll.ts
@ -25,43 +25,128 @@
 */

 import { getSpa } from 'nrel-spa';
-import { toJulianDate, solarEphemeris } from './getSolarEphemeris.js';
-import { getAngles } from './getAngles.js';
+import { computeAngles } from './getAngles.js';
 import { getAsr } from './getAsr.js';
 import { getQiyam } from './getQiyam.js';
 import { getMscFajr, getMscIsha } from './getMSC.js';
+import { validateInputs } from './validate.js';
+import { DHUHR_OFFSET_MINUTES } from './constants.js';
 import type { MethodDefinition, PrayerTimesAll } from './types.js';

 /** All supported traditional methods. */
 const METHODS: MethodDefinition[] = [
-  { id: 'UOIF',    name: 'Union des Organisations Islamiques de France',         region: 'France',          fajrAngle: 12,   ishaAngle: 12   },
-  { id: 'ISNACA',  name: 'IQNA / Islamic Council of North America',              region: 'Canada',          fajrAngle: 13,   ishaAngle: 13   },
-  { id: 'ISNA',    name: 'FCNA / Islamic Society of North America',              region: 'US, UK, AU, NZ',  fajrAngle: 15,   ishaAngle: 15   },
-  { id: 'SAMR',    name: 'Spiritual Administration of Muslims of Russia',        region: 'Russia',          fajrAngle: 16,   ishaAngle: 15   },
-  { id: 'IGUT',    name: 'Institute of Geophysics, University of Tehran',        region: 'Iran',            fajrAngle: 17.7, ishaAngle: 14   },
+  {
+    id: 'UOIF',
+    name: 'Union des Organisations Islamiques de France',
+    region: 'France',
+    fajrAngle: 12,
+    ishaAngle: 12,
+  },
+  {
+    id: 'ISNACA',
+    name: 'IQNA / Islamic Council of North America',
+    region: 'Canada',
+    fajrAngle: 13,
+    ishaAngle: 13,
+  },
+  {
+    id: 'ISNA',
+    name: 'FCNA / Islamic Society of North America',
+    region: 'US, UK, AU, NZ',
+    fajrAngle: 15,
+    ishaAngle: 15,
+  },
+  {
+    id: 'SAMR',
+    name: 'Spiritual Administration of Muslims of Russia',
+    region: 'Russia',
+    fajrAngle: 16,
+    ishaAngle: 15,
+  },
+  {
+    id: 'IGUT',
+    name: 'Institute of Geophysics, University of Tehran',
+    region: 'Iran',
+    fajrAngle: 17.7,
+    ishaAngle: 14,
+  },
  { id: 'MWL', name: 'Muslim World League', region: 'Global', fajrAngle: 18, ishaAngle: 17 },
-  { id: 'DIBT',    name: 'Diyanet İşleri Başkanlığı, Turkey',                    region: 'Turkey',          fajrAngle: 18,   ishaAngle: 17   },
-  { id: 'Karachi', name: 'University of Islamic Sciences, Karachi',              region: 'PK, BD, IN, AF',  fajrAngle: 18,   ishaAngle: 18   },
-  { id: 'Kuwait',  name: 'Kuwait Ministry of Islamic Affairs',                   region: 'Kuwait',          fajrAngle: 18,   ishaAngle: 17.5 },
-  { id: 'UAQ',     name: 'Umm Al-Qura University, Makkah',                      region: 'Saudi Arabia',    fajrAngle: 18.5, ishaAngle: null, ishaMinutes: 90  },
-  { id: 'Qatar',   name: 'Qatar / Gulf Standard',                                region: 'Qatar, Gulf',     fajrAngle: 18,   ishaAngle: null, ishaMinutes: 90  },
-  { id: 'Egypt',   name: 'Egyptian General Authority of Survey',                 region: 'EG, SY, IQ, LB',  fajrAngle: 19.5, ishaAngle: 17.5 },
-  { id: 'MUIS',    name: 'Majlis Ugama Islam Singapura',                         region: 'Singapore',       fajrAngle: 20,   ishaAngle: 18   },
-  { id: 'MSC',     name: 'Moonsighting Committee Worldwide',                     region: 'Global',          fajrAngle: null, ishaAngle: null, useMSC: true },
+  {
+    id: 'DIBT',
+    name: 'Diyanet İşleri Başkanlığı, Turkey',
+    region: 'Turkey',
+    fajrAngle: 18,
+    ishaAngle: 17,
+  },
+  {
+    id: 'Karachi',
+    name: 'University of Islamic Sciences, Karachi',
+    region: 'PK, BD, IN, AF',
+    fajrAngle: 18,
+    ishaAngle: 18,
+  },
+  {
+    id: 'Kuwait',
+    name: 'Kuwait Ministry of Islamic Affairs',
+    region: 'Kuwait',
+    fajrAngle: 18,
+    ishaAngle: 17.5,
+  },
+  {
+    id: 'UAQ',
+    name: 'Umm Al-Qura University, Makkah',
+    region: 'Saudi Arabia',
+    fajrAngle: 18.5,
+    ishaAngle: null,
+    ishaMinutes: 90,
+  },
+  {
+    id: 'Qatar',
+    name: 'Qatar / Gulf Standard',
+    region: 'Qatar, Gulf',
+    fajrAngle: 18,
+    ishaAngle: null,
+    ishaMinutes: 90,
+  },
+  {
+    id: 'Egypt',
+    name: 'Egyptian General Authority of Survey',
+    region: 'EG, SY, IQ, LB',
+    fajrAngle: 19.5,
+    ishaAngle: 17.5,
+  },
+  {
+    id: 'MUIS',
+    name: 'Majlis Ugama Islam Singapura',
+    region: 'Singapore',
+    fajrAngle: 20,
+    ishaAngle: 18,
+  },
+  {
+    id: 'MSC',
+    name: 'Moonsighting Committee Worldwide',
+    region: 'Global',
+    fajrAngle: null,
+    ishaAngle: null,
+    useMSC: true,
+  },
 ];

 /**
 * Compute prayer times plus all traditional method comparisons.
 *
- * @param date        - Observer's local date
- * @param lat         - Latitude in decimal degrees
- * @param lng         - Longitude in decimal degrees
+ * @param date        - Observer's local date (time-of-day is ignored)
+ * @param lat         - Latitude in decimal degrees (-90 to 90)
+ * @param lng         - Longitude in decimal degrees (-180 to 180)
 * @param tz          - UTC offset in hours (defaults to system tz)
 * @param elevation   - Observer elevation in meters (default: 0)
 * @param temperature - Ambient temperature in °C (default: 15)
 * @param pressure    - Atmospheric pressure in mbar (default: 1013.25)
 * @param hanafi      - Asr convention: false = Shafi'i (default), true = Hanafi
- * @returns Prayer times for the dynamic method plus all traditional methods
+ * @returns Prayer times for the dynamic method plus all traditional methods.
+ *          Any time that cannot be computed is returned as `NaN`.
+ *          Methods map contains `[fajrTime, ishaTime]` per method.
+ * @throws {RangeError} if lat, lng, tz, or elevation are out of valid range
 */
 export function getTimesAll(
  date: Date,
@ -73,8 +158,17 @@ export function getTimesAll(
  pressure = 1013.25,
  hanafi = false,
 ): PrayerTimesAll {
-  // 1. Dynamic angles.
-  const { fajrAngle, ishaAngle } = getAngles(date, lat, lng, elevation, temperature, pressure);
+  validateInputs(lat, lng, tz, elevation);
+
+  // 1. Dynamic angles and reusable solar declination.
+  const { fajrAngle, ishaAngle, decl } = computeAngles(
+    date,
+    lat,
+    lng,
+    elevation,
+    temperature,
+    pressure,
+  );

  // 2. Build batch zenith angles for the SPA call:
  //    Slot 0: dynamic Fajr, Slot 1: dynamic Isha, then pairs for each method.
@ -102,14 +196,9 @@ export function getTimesAll(
  const noonTime = spaData.solarNoon;
  const maghribTime = spaData.sunset;
  const ishaTime = spaData.angles[1].sunset;
-  const dhuhrTime   = noonTime + 2.5 / 60;
-
-  // 4. Solar declination for Asr.
-  const jd = toJulianDate(
-    new Date(Date.UTC(date.getFullYear(), date.getMonth(), date.getDate(), 12, 0, 0)),
-  );
-  const { decl } = solarEphemeris(jd);
+  const dhuhrTime = noonTime + DHUHR_OFFSET_MINUTES / 60;

+  // 4. Asr time (reuses declination from computeAngles — no extra ephemeris call).
  const asrTime = getAsr(noonTime, lat, decl, hanafi);
  const qiyamTime = getQiyam(fajrTime, ishaTime);

--- a/src/index.ts
+++ b/src/index.ts
@ -24,6 +24,7 @@ export { getAsr } from './getAsr.js';
 export { getQiyam } from './getQiyam.js';
 export { getMscFajr, getMscIsha } from './getMSC.js';
 export { solarEphemeris, toJulianDate } from './getSolarEphemeris.js';
+export { DHUHR_OFFSET_MINUTES, ANGLE_MIN, ANGLE_MAX } from './constants.js';

 export type {
  FractionalHours,
--- a/src/types.ts
+++ b/src/types.ts
@ -57,8 +57,16 @@ export interface FormattedPrayerTimes {
  angles: TwilightAngles;
 }

-/** Method entry in the Methods map: [fajrTime, ishaTime] as fractional hours. */
-export type MethodEntry = [FractionalHours, FractionalHours];
+/**
+ * Method entry in the Methods map: `[fajrTime, ishaTime]` as fractional hours.
+ *
+ * - Index 0 (`fajr`): Fajr time for this method (fractional hours, or `NaN`)
+ * - Index 1 (`isha`): Isha time for this method (fractional hours, or `NaN`)
+ *
+ * A value of `NaN` indicates the event is unreachable at this location/date
+ * (e.g. the sun never dips to 18° below the horizon at high latitudes in summer).
+ */
+export type MethodEntry = [fajr: FractionalHours, isha: FractionalHours];

 /** Prayer times plus all method comparison times as fractional hours. */
 export interface PrayerTimesAll extends PrayerTimes {
--- a/src/validate.ts
+++ b/src/validate.ts
@ -0,0 +1,23 @@
+/**
+ * Input validation for public API boundaries.
+ */
+
+/**
+ * Validate geographic and atmospheric inputs for prayer time computation.
+ *
+ * @throws {RangeError} if any parameter is out of its valid range
+ */
+export function validateInputs(lat: number, lng: number, tz?: number, elevation?: number): void {
+  if (!Number.isFinite(lat) || lat < -90 || lat > 90) {
+    throw new RangeError(`latitude must be between -90 and 90, got ${lat}`);
+  }
+  if (!Number.isFinite(lng) || lng < -180 || lng > 180) {
+    throw new RangeError(`longitude must be between -180 and 180, got ${lng}`);
+  }
+  if (tz !== undefined && (!Number.isFinite(tz) || tz < -14 || tz > 14)) {
+    throw new RangeError(`timezone offset must be between -14 and 14, got ${tz}`);
+  }
+  if (elevation !== undefined && (!Number.isFinite(elevation) || elevation < -500)) {
+    throw new RangeError(`elevation must be >= -500m, got ${elevation}`);
+  }
+}
--- a/test-cjs.cjs
+++ b/test-cjs.cjs
@ -6,7 +6,8 @@

 'use strict';

-const assert = require('assert');
+const { describe, it } = require('node:test');
+const assert = require('node:assert/strict');
 const {
  getTimes,
  calcTimes,
@ -22,101 +23,83 @@ const {
  METHODS,
 } = 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('\n[CJS] Core exports');
-
-test('METHODS exported and has 14 entries', () => {
+describe('[CJS] Core exports', () => {
+  it('METHODS exported and has 14 entries', () => {
    assert(Array.isArray(METHODS));
    assert.strictEqual(METHODS.length, 14);
-});
+  });

-test('getTimes returns valid structure', () => {
+  it('getTimes returns valid structure', () => {
    const t = getTimes(new Date('2024-06-21'), 40.7128, -74.0060, -4);
    assert(isFinite(t.Fajr), `Fajr=${t.Fajr}`);
    assert(isFinite(t.Sunrise), `Sunrise=${t.Sunrise}`);
    assert(isFinite(t.Maghrib), `Maghrib=${t.Maghrib}`);
    assert(isFinite(t.Isha), `Isha=${t.Isha}`);
    assert(typeof t.angles.fajrAngle === 'number');
-});
+  });

-test('calcTimes returns HH:MM:SS strings', () => {
+  it('calcTimes returns HH:MM:SS strings', () => {
    const t = calcTimes(new Date('2024-06-21'), 40.7128, -74.0060, -4);
    assert(/^\d{2}:\d{2}:\d{2}$/.test(t.Fajr), `Fajr="${t.Fajr}"`);
    assert(/^\d{2}:\d{2}:\d{2}$/.test(t.Sunrise), `Sunrise="${t.Sunrise}"`);
    assert(/^\d{2}:\d{2}:\d{2}$/.test(t.Maghrib), `Maghrib="${t.Maghrib}"`);
-});
+  });

-test('getTimesAll returns 14 methods', () => {
+  it('getTimesAll returns 14 methods', () => {
    const t = getTimesAll(new Date('2024-06-21'), 40.7128, -74.0060, -4);
    assert.strictEqual(Object.keys(t.Methods).length, 14);
-});
+  });

-test('calcTimesAll Methods are string pairs', () => {
+  it('calcTimesAll Methods are string pairs', () => {
    const t = calcTimesAll(new Date('2024-06-21'), 40.7128, -74.0060, -4);
    for (const [fajr, isha] of Object.values(t.Methods)) {
      assert(typeof fajr === 'string');
      assert(typeof isha === 'string');
    }
-});
+  });

-test('getAngles returns bounded angles', () => {
+  it('getAngles returns bounded angles', () => {
    const a = getAngles(new Date('2024-06-21'), 40.7128, -74.0060);
    assert(a.fajrAngle >= 10 && a.fajrAngle <= 22);
    assert(a.ishaAngle >= 10 && a.ishaAngle <= 22);
-});
+  });

-test('getAsr Hanafi later than Shafii', () => {
+  it('getAsr Hanafi later than Shafii', () => {
    const s = getAsr(12.0, 40.7, 20.0, false);
    const h = getAsr(12.0, 40.7, 20.0, true);
    assert(h > s);
-});
+  });

-test('getQiyam returns a number', () => {
+  it('getQiyam returns a number', () => {
    const q = getQiyam(4.0, 22.0);
    assert(typeof q === 'number');
-});
+  });

-test('getMscFajr returns positive minutes', () => {
+  it('getMscFajr returns positive minutes', () => {
    const m = getMscFajr(new Date('2024-06-21'), 40.7);
    assert(m > 0);
-});
+  });

-test('getMscIsha returns positive minutes', () => {
+  it('getMscIsha returns positive minutes', () => {
    const m = getMscIsha(new Date('2024-06-21'), 40.7);
    assert(m > 0);
-});
+  });

-test('toJulianDate and solarEphemeris work', () => {
+  it('toJulianDate and solarEphemeris work', () => {
    const jd = toJulianDate(new Date(Date.UTC(2024, 5, 21, 12, 0, 0)));
    const e = solarEphemeris(jd);
    assert(typeof e.decl === 'number');
    assert(typeof e.r === 'number');
    assert(typeof e.eclLon === 'number');
-});
+  });

-test('Makkah all-methods comparison — UAQ Isha = Maghrib + 90min', () => {
+  it('Makkah all-methods comparison — UAQ Isha = Maghrib + 90min', () => {
    const t = getTimesAll(new Date('2024-06-21'), 21.4225, 39.8262, 3);
    const diff = (t.Methods.UAQ[1] - t.Maghrib) * 60;
    assert(Math.abs(diff - 90) < 2, `UAQ isha diff=${diff}`);
+  });
+
+  it('rejects invalid inputs', () => {
+    assert.throws(() => getTimes(new Date('2024-06-21'), 91, 0, 0), { name: 'RangeError' });
+  });
 });
-
-const total = passed + failed;
-console.log(`\n${'─'.repeat(50)}`);
-console.log(`${passed}/${total} CJS tests passed`);
-
-if (failed > 0) {
-  process.exit(1);
-}
--- a/test.mjs
+++ b/test.mjs
@ -1,5 +1,5 @@
 /**
- * pray-calc v2 test suite — 100 scenarios.
+ * pray-calc v2 test suite.
 *
 * Tests cover:
 *   - Equatorial, tropical, mid-latitude, high-latitude locations
@ -7,12 +7,13 @@
 *   - Both Asr conventions (Shafi'i / Hanafi)
 *   - Atmospheric parameters (pressure, temperature, elevation)
 *   - All exported functions
- *   - Edge cases (polar regions, missing events)
+ *   - Edge cases (polar regions, missing events, invalid inputs)
 *   - Dynamic vs. traditional method comparison
 *   - Type exports and METHODS array
 */

-import assert from 'assert';
+import { describe, it } from 'node:test';
+import assert from 'node:assert/strict';
 import {
  getTimes,
  calcTimes,
@ -26,36 +27,19 @@ import {
  solarEphemeris,
  toJulianDate,
  METHODS,
+  DHUHR_OFFSET_MINUTES,
+  ANGLE_MIN,
+  ANGLE_MAX,
 } 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++;
-  }
-}
-
 function approx(a, b, tol = 0.05) {
-  // Times within ±tol hours (~3 minutes default tolerance)
  return Math.abs(a - b) < tol;
 }

 function approxAngle(a, b, tol = 0.5) {
-  // Angles within ±tol degrees
  return Math.abs(a - b) < tol;
 }

-function validTime(t) {
-  return typeof t === 'number' && isFinite(t) && t >= 0 && t < 24;
-}
-
 function hm(h, m) {
  return h + m / 60;
 }
@ -63,21 +47,20 @@ function hm(h, m) {
 // ─────────────────────────────────────────────────────────────────────────────
 // Section 1: Exports and type structure
 // ─────────────────────────────────────────────────────────────────────────────
-console.log('\n[1] Exports and type structure');
-
-test('METHODS array has 14 entries', () => {
+describe('Exports and type structure', () => {
+  it('METHODS array has 14 entries', () => {
    assert.strictEqual(METHODS.length, 14);
-});
+  });

-test('METHODS has expected IDs', () => {
+  it('METHODS has expected IDs', () => {
    const ids = METHODS.map(m => m.id);
    for (const expected of ['UOIF','ISNACA','ISNA','SAMR','IGUT','MWL','DIBT',
        'Karachi','Kuwait','UAQ','Qatar','Egypt','MUIS','MSC']) {
      assert(ids.includes(expected), `Missing method: ${expected}`);
    }
-});
+  });

-test('METHODS fields present', () => {
+  it('METHODS fields present', () => {
    for (const m of METHODS) {
      assert(typeof m.id === 'string');
      assert(typeof m.name === 'string');
@ -85,57 +68,65 @@ test('METHODS fields present', () => {
      assert(m.fajrAngle === null || typeof m.fajrAngle === 'number');
      assert(m.ishaAngle === null || typeof m.ishaAngle === 'number');
    }
-});
+  });

-test('MSC method has useMSC=true and null angles', () => {
+  it('MSC method has useMSC=true and null angles', () => {
    const msc = METHODS.find(m => m.id === 'MSC');
    assert(msc.useMSC === true);
    assert(msc.fajrAngle === null);
    assert(msc.ishaAngle === null);
-});
+  });

-test('UAQ has ishaMinutes=90', () => {
+  it('UAQ has ishaMinutes=90', () => {
    const uaq = METHODS.find(m => m.id === 'UAQ');
    assert.strictEqual(uaq.ishaMinutes, 90);
-});
+  });

-test('Qatar has ishaMinutes=90', () => {
+  it('Qatar has ishaMinutes=90', () => {
    const qatar = METHODS.find(m => m.id === 'Qatar');
    assert.strictEqual(qatar.ishaMinutes, 90);
+  });
+
+  it('DHUHR_OFFSET_MINUTES is exported and equals 2.5', () => {
+    assert.strictEqual(DHUHR_OFFSET_MINUTES, 2.5);
+  });
+
+  it('ANGLE_MIN and ANGLE_MAX are exported', () => {
+    assert.strictEqual(ANGLE_MIN, 10);
+    assert.strictEqual(ANGLE_MAX, 22);
+  });
 });

 // ─────────────────────────────────────────────────────────────────────────────
 // Section 2: toJulianDate and solarEphemeris
 // ─────────────────────────────────────────────────────────────────────────────
-console.log('\n[2] Solar ephemeris');
-
-test('toJulianDate J2000 epoch', () => {
-  // Jan 1.5, 2000 = JD 2451545.0
+describe('Solar ephemeris', () => {
+  it('toJulianDate J2000 epoch', () => {
    const jd = toJulianDate(new Date(Date.UTC(2000, 0, 1, 12, 0, 0)));
    assert(approxAngle(jd, 2451545.0, 1.0), `Got ${jd}`);
-});
+  });

-test('solarEphemeris returns valid structure', () => {
+  it('solarEphemeris returns valid structure', () => {
    const jd = toJulianDate(new Date(Date.UTC(2024, 5, 21, 12, 0, 0)));
    const e = solarEphemeris(jd);
    assert(typeof e.decl === 'number');
    assert(typeof e.r === 'number');
    assert(typeof e.eclLon === 'number');
-});
+  });

-test('solarEphemeris summer solstice declination ~+23.44', () => {
+  it('solarEphemeris summer solstice declination ~+23.44', () => {
    const jd = toJulianDate(new Date(Date.UTC(2024, 5, 21, 12, 0, 0)));
    const { decl } = solarEphemeris(jd);
    assert(approxAngle(decl, 23.44, 0.15), `Got decl=${decl}`);
-});
+  });

-test('solarEphemeris winter solstice declination ~-23.44', () => {
+  it('solarEphemeris winter solstice declination ~-23.44', () => {
    const jd = toJulianDate(new Date(Date.UTC(2024, 11, 21, 12, 0, 0)));
    const { decl } = solarEphemeris(jd);
    assert(approxAngle(decl, -23.44, 0.15), `Got decl=${decl}`);
-});
+  });

-test('solarEphemeris r within range [0.98, 1.02] AU', () => {
+  it('solarEphemeris r within range [0.98, 1.02] AU', () => {
    const dates = [
      new Date(Date.UTC(2024, 0, 3)),   // perihelion
      new Date(Date.UTC(2024, 6, 4)),   // aphelion
@ -145,26 +136,26 @@ test('solarEphemeris r within range [0.98, 1.02] AU', () => {
      const { r } = solarEphemeris(toJulianDate(d));
      assert(r > 0.98 && r < 1.02, `r=${r} out of range for ${d}`);
    }
-});
+  });

-test('solarEphemeris equinox declination near 0', () => {
+  it('solarEphemeris equinox declination near 0', () => {
    const jd = toJulianDate(new Date(Date.UTC(2024, 2, 20, 12, 0, 0)));
    const { decl } = solarEphemeris(jd);
    assert(Math.abs(decl) < 1.0, `Got decl=${decl} at equinox`);
+  });
 });

 // ─────────────────────────────────────────────────────────────────────────────
 // Section 3: getAngles — dynamic Fajr/Isha depression
 // ─────────────────────────────────────────────────────────────────────────────
-console.log('\n[3] getAngles — dynamic depression');
-
-test('getAngles returns object with fajrAngle and ishaAngle', () => {
+describe('getAngles — dynamic depression', () => {
+  it('returns object with fajrAngle and ishaAngle', () => {
    const a = getAngles(new Date('2024-06-21'), 40.7, -74.0);
    assert(typeof a.fajrAngle === 'number');
    assert(typeof a.ishaAngle === 'number');
-});
+  });

-test('getAngles angles within physical bounds [10,22]', () => {
+  it('angles within physical bounds [10,22]', () => {
    const locations = [
      [0, 0], [21, 39], [40.7, -74], [51.5, -0.1], [55.8, -4.2], [-33.9, 151.2],
    ];
@ -178,127 +169,116 @@ test('getAngles angles within physical bounds [10,22]', () => {
          `ishaAngle=${ishaAngle} out of [10,22] at lat=${lat} ${d}`);
      }
    }
-});
+  });

-test('getAngles equatorial latitude near 18', () => {
-  // Near equator, should converge toward ~18°
-  const { fajrAngle } = getAngles(new Date('2024-06-21'), 1.3, 103.8); // Singapore
+  it('equatorial latitude near 18', () => {
+    const { fajrAngle } = getAngles(new Date('2024-06-21'), 1.3, 103.8);
    assert(fajrAngle > 16 && fajrAngle < 22, `fajrAngle=${fajrAngle}`);
-});
+  });

-test('getAngles high-latitude summer smaller than 18', () => {
-  // London summer — angle should be well below 18 due to oblique sun path
+  it('high-latitude summer smaller than 18', () => {
    const { fajrAngle } = getAngles(new Date('2024-06-21'), 51.5, -0.1);
    assert(fajrAngle < 17, `Expected <17, got ${fajrAngle} at London summer solstice`);
-});
+  });

-test('getAngles elevation parameter accepted', () => {
+  it('elevation parameter accepted', () => {
    const a1 = getAngles(new Date('2024-06-21'), 40.7, -74.0, 0);
    const a2 = getAngles(new Date('2024-06-21'), 40.7, -74.0, 1000);
    assert(typeof a1.fajrAngle === 'number');
    assert(typeof a2.fajrAngle === 'number');
-  // At high elevation, effective depression should be slightly reduced
    assert(a2.fajrAngle <= a1.fajrAngle + 0.5, 'Elevation should not increase angle by more than 0.5');
+  });
 });

 // ─────────────────────────────────────────────────────────────────────────────
 // Section 4: getAsr
 // ─────────────────────────────────────────────────────────────────────────────
-console.log('\n[4] getAsr');
-
-test('getAsr Shafii returns finite time', () => {
+describe('getAsr', () => {
+  it('Shafii returns finite time', () => {
    const asr = getAsr(12.0, 40.7128, 20.0, false);
    assert(isFinite(asr), `Expected finite, got ${asr}`);
-});
+  });

-test('getAsr Hanafi is later than Shafii', () => {
+  it('Hanafi is later than Shafii', () => {
    const asrS = getAsr(12.0, 40.7, 20.0, false);
    const asrH = getAsr(12.0, 40.7, 20.0, true);
    assert(asrH > asrS, `Hanafi ${asrH} should be later than Shafi'i ${asrS}`);
-});
+  });

-test('getAsr reasonable range (afternoon)', () => {
-  const asr = getAsr(12.1, 21.4, 20.0, false); // Makkah-ish
+  it('reasonable range (afternoon)', () => {
+    const asr = getAsr(12.1, 21.4, 20.0, false);
    assert(asr > 14 && asr < 18, `Got ${asr}`);
-});
+  });

-test('getAsr Hanafi Makkah afternoon', () => {
+  it('Hanafi Makkah afternoon', () => {
    const asr = getAsr(12.1, 21.4, 20.0, true);
    assert(asr > 15 && asr < 19, `Got ${asr}`);
-});
+  });

-test('getAsr returns NaN when sun never reaches altitude', () => {
-  // Extreme case: very high latitude, extreme declination
+  it('returns NaN when sun never reaches altitude', () => {
    const asr = getAsr(12.0, 89.0, -23.4, false);
-  // Near north pole in winter, sun may not reach Asr altitude
-  // Result should be NaN or finite — just verify it returns a number
    assert(typeof asr === 'number', 'Should return a number');
+  });
 });

 // ─────────────────────────────────────────────────────────────────────────────
 // Section 5: getQiyam
 // ─────────────────────────────────────────────────────────────────────────────
-console.log('\n[5] getQiyam');
-
-test('getQiyam returns last-third start', () => {
-  // Isha at 22:00, Fajr at 04:00 next day → night = 6h
-  // Last third starts at 22 + 4 = 02:00
+describe('getQiyam', () => {
+  it('returns last-third start', () => {
    const q = getQiyam(4.0, 22.0);
    assert(approx(q, 2.0, 0.1), `Got ${q}`);
-});
+  });

-test('getQiyam handles wrap-around midnight', () => {
+  it('handles wrap-around midnight', () => {
    const q = getQiyam(3.5, 21.0);
-  // Night = 3.5 + 24 - 21 = 6.5h; last third = 21 + (2/3)*6.5 = 25.33 → 1.33 (01:20)
    const expected = 21.0 + (2 / 3) * (3.5 + 24 - 21.0);
    const normalized = expected >= 24 ? expected - 24 : expected;
    assert(approx(q, normalized, 0.1), `Got ${q}, expected ~${normalized}`);
+  });
 });

 // ─────────────────────────────────────────────────────────────────────────────
 // Section 6: getMscFajr / getMscIsha
 // ─────────────────────────────────────────────────────────────────────────────
-console.log('\n[6] MSC minute offsets');
-
-test('getMscFajr returns positive minutes', () => {
+describe('MSC minute offsets', () => {
+  it('getMscFajr returns positive minutes', () => {
    const m = getMscFajr(new Date('2024-06-21'), 40.7);
    assert(m > 0, `Got ${m}`);
-});
+  });

-test('getMscIsha returns positive minutes', () => {
+  it('getMscIsha returns positive minutes', () => {
    const m = getMscIsha(new Date('2024-06-21'), 40.7);
    assert(m > 0, `Got ${m}`);
-});
+  });

-test('getMscFajr increases with latitude (summer)', () => {
+  it('getMscFajr increases with latitude (summer)', () => {
    const m30 = getMscFajr(new Date('2024-06-21'), 30);
    const m50 = getMscFajr(new Date('2024-06-21'), 50);
    assert(m50 > m30, `Expected lat50 (${m50}) > lat30 (${m30})`);
-});
+  });

-test('getMscFajr equator ~75 minutes year-round', () => {
+  it('getMscFajr equator ~75 minutes year-round', () => {
    const summer = getMscFajr(new Date('2024-06-21'), 0);
    const winter = getMscFajr(new Date('2024-12-21'), 0);
    assert(approx(summer, 75, 5), `Summer: ${summer}`);
    assert(approx(winter, 75, 5), `Winter: ${winter}`);
-});
+  });

-test('getMscIsha shafaq modes return different values at high lat', () => {
+  it('getMscIsha shafaq modes return different values at high lat', () => {
    const general = getMscIsha(new Date('2024-06-21'), 51.5, 'general');
    const ahmer   = getMscIsha(new Date('2024-06-21'), 51.5, 'ahmer');
    const abyad   = getMscIsha(new Date('2024-06-21'), 51.5, 'abyad');
-  // All should be positive
    assert(general > 0 && ahmer > 0 && abyad > 0);
-  // Ahmer (red glow) ends earlier, so fewer minutes after sunset
    assert(ahmer <= general, `ahmer ${ahmer} should be <= general ${general}`);
+  });
 });

 // ─────────────────────────────────────────────────────────────────────────────
 // Section 7: getTimes — core output structure
 // ─────────────────────────────────────────────────────────────────────────────
-console.log('\n[7] getTimes — structure');
-
-test('getTimes returns all required fields', () => {
+describe('getTimes — structure', () => {
+  it('returns all required fields', () => {
    const t = getTimes(new Date('2024-06-21'), 40.7, -74.0);
    for (const field of ['Qiyam','Fajr','Sunrise','Noon','Dhuhr','Asr','Maghrib','Isha']) {
      assert(field in t, `Missing field: ${field}`);
@ -306,184 +286,169 @@ test('getTimes returns all required fields', () => {
    assert('angles' in t);
    assert('fajrAngle' in t.angles);
    assert('ishaAngle' in t.angles);
-});
+  });

-test('getTimes chronological order', () => {
-  // Use explicit tz=-4 (EDT) so CI (UTC) and local machines give identical results.
-  // Without it, NY's Maghrib falls past UTC midnight, wrapping to ~0.5h < Asr(~21h).
+  it('chronological order', () => {
    const t = getTimes(new Date('2024-06-21'), 40.7, -74.0, -4);
-  // Fajr < Sunrise < Noon < Dhuhr ≈ Noon < Asr < Maghrib < Isha
    assert(t.Fajr < t.Sunrise, `Fajr(${t.Fajr}) < Sunrise(${t.Sunrise})`);
    assert(t.Sunrise < t.Noon, `Sunrise(${t.Sunrise}) < Noon(${t.Noon})`);
    assert(t.Noon <= t.Dhuhr, `Noon(${t.Noon}) <= Dhuhr(${t.Dhuhr})`);
    assert(t.Dhuhr < t.Asr, `Dhuhr(${t.Dhuhr}) < Asr(${t.Asr})`);
    assert(t.Asr < t.Maghrib, `Asr(${t.Asr}) < Maghrib(${t.Maghrib})`);
    assert(t.Maghrib < t.Isha, `Maghrib(${t.Maghrib}) < Isha(${t.Isha})`);
-});
+  });

-test('getTimes Dhuhr is slightly after Noon', () => {
+  it('Dhuhr is slightly after Noon', () => {
    const t = getTimes(new Date('2024-06-21'), 40.7, -74.0);
-  const diff = (t.Dhuhr - t.Noon) * 60; // minutes
+    const diff = (t.Dhuhr - t.Noon) * 60;
    assert(diff > 2 && diff < 4, `Dhuhr - Noon = ${diff} min`);
-});
+  });

-test('getTimes angles present and in bounds', () => {
+  it('angles present and in bounds', () => {
    const t = getTimes(new Date('2024-06-21'), 40.7, -74.0);
    assert(t.angles.fajrAngle > 10 && t.angles.fajrAngle < 22);
    assert(t.angles.ishaAngle > 10 && t.angles.ishaAngle < 22);
+  });
 });

 // ─────────────────────────────────────────────────────────────────────────────
 // Section 8: getTimes — geographic validation
 // ─────────────────────────────────────────────────────────────────────────────
-console.log('\n[8] getTimes — geographic scenarios');
+describe('getTimes — geographic scenarios', () => {
+  const TOL = 0.07; // ~4 minutes

-// Reference times from independent sources (tolerances ±4 min = 0.067h)
-const TOL = 0.07; // ~4 minutes
-
-test('Makkah summer solstice — Sunrise ~05:39', () => {
-  // Makkah 39.83°E, UTC+3: solar noon ~12:23 local. Sunrise ~5:39.
+  it('Makkah summer solstice — Sunrise ~05:39', () => {
    const t = getTimes(new Date('2024-06-21'), 21.4225, 39.8262, 3);
    assert(approx(t.Sunrise, hm(5,39), 0.12), `Got ${t.Sunrise}`);
-});
+  });

-test('Makkah summer solstice — Maghrib ~19:06', () => {
-  // Makkah summer solstice sunset: ~19:06-19:10 local.
+  it('Makkah summer solstice — Maghrib ~19:06', () => {
    const t = getTimes(new Date('2024-06-21'), 21.4225, 39.8262, 3);
    assert(approx(t.Maghrib, hm(19,7), 0.12), `Got ${t.Maghrib}`);
-});
+  });

-test('New York summer solstice — Sunrise ~05:25', () => {
+  it('New York summer solstice — Sunrise ~05:25', () => {
    const t = getTimes(new Date('2024-06-21'), 40.7128, -74.0060, -4);
    assert(approx(t.Sunrise, hm(5,25), TOL), `Got ${t.Sunrise}`);
-});
+  });

-test('New York summer solstice — Sunset ~20:31', () => {
+  it('New York summer solstice — Sunset ~20:31', () => {
    const t = getTimes(new Date('2024-06-21'), 40.7128, -74.0060, -4);
    assert(approx(t.Maghrib, hm(20,31), TOL), `Got ${t.Maghrib}`);
-});
+  });

-test('New York winter solstice — Sunrise ~07:20', () => {
+  it('New York winter solstice — Sunrise ~07:20', () => {
    const t = getTimes(new Date('2024-12-21'), 40.7128, -74.0060, -5);
    assert(approx(t.Sunrise, hm(7,20), TOL), `Got ${t.Sunrise}`);
-});
+  });

-test('New York winter solstice — Sunset ~16:32', () => {
+  it('New York winter solstice — Sunset ~16:32', () => {
    const t = getTimes(new Date('2024-12-21'), 40.7128, -74.0060, -5);
    assert(approx(t.Maghrib, hm(16,32), TOL), `Got ${t.Maghrib}`);
-});
+  });

-test('London summer — Sunrise ~04:43', () => {
+  it('London summer — Sunrise ~04:43', () => {
    const t = getTimes(new Date('2024-06-21'), 51.5074, -0.1278, 1);
    assert(approx(t.Sunrise, hm(4,43), TOL), `Got ${t.Sunrise}`);
-});
+  });

-test('London summer — Sunset ~21:21', () => {
+  it('London summer — Sunset ~21:21', () => {
    const t = getTimes(new Date('2024-06-21'), 51.5074, -0.1278, 1);
    assert(approx(t.Maghrib, hm(21,21), TOL), `Got ${t.Maghrib}`);
-});
+  });

-test('Sydney summer (Gregorian Jan) — Sunrise ~06:00', () => {
-  // Sydney 151.21°E, UTC+11: solar noon ~12:04. Sunrise ~5:59-6:01 Jan 15.
+  it('Sydney summer (Gregorian Jan) — Sunrise ~06:00', () => {
    const t = getTimes(new Date('2024-01-15'), -33.8688, 151.2093, 11);
    assert(approx(t.Sunrise, hm(6,0), 0.12), `Got ${t.Sunrise}`);
-});
+  });

-test('Jakarta — Sunrise within 20min of 5:50 year-round', () => {
-  // Jakarta 106.85°E, UTC+7: sunrise varies 5:30-6:10 across the year.
+  it('Jakarta — Sunrise within 20min of 5:50 year-round', () => {
    for (const month of [1, 4, 7, 10]) {
      const t = getTimes(new Date(`2024-${String(month).padStart(2,'0')}-15`),
                         -6.2088, 106.8456, 7);
      assert(approx(t.Sunrise, hm(5,50), 0.33), `Month ${month}: Sunrise=${t.Sunrise}`);
    }
-});
+  });

-test('Singapore — all times finite', () => {
+  it('Singapore — all times finite', () => {
    const t = getTimes(new Date('2024-06-21'), 1.3521, 103.8198, 8);
    for (const field of ['Fajr','Sunrise','Noon','Dhuhr','Asr','Maghrib','Isha']) {
      assert(isFinite(t[field]), `${field} should be finite`);
    }
-});
+  });

-test('Cairo summer — Sunrise ~06:00 ±12min', () => {
+  it('Cairo summer — Sunrise ~06:00 ±12min', () => {
    const t = getTimes(new Date('2024-06-21'), 30.0444, 31.2357, 3);
    assert(approx(t.Sunrise, hm(6, 0), 0.20), `Got ${t.Sunrise}`);
-});
+  });

-test('Istanbul spring equinox — Noon ~13:11 ±10min', () => {
-  // Istanbul 28.98°E, UTC+3: solar noon = 12:00 + (45-28.98)/15 = 13:04 + eq-of-time ~7min = ~13:11
+  it('Istanbul spring equinox — Noon ~13:11 ±10min', () => {
    const t = getTimes(new Date('2024-03-20'), 41.0082, 28.9784, 3);
    assert(approx(t.Noon, hm(13,11), 0.17), `Got ${t.Noon}`);
-});
+  });

-test('Karachi summer — Maghrib ~19:20 ±10min', () => {
+  it('Karachi summer — Maghrib ~19:20 ±10min', () => {
    const t = getTimes(new Date('2024-06-21'), 24.8607, 67.0011, 5);
    assert(approx(t.Maghrib, hm(19,20), 0.17), `Got ${t.Maghrib}`);
-});
+  });

-test('Toronto summer — Sunset ~21:02 ±12min', () => {
-  // Toronto 79.38°W, UTC-4: solar noon ~13:17. Sunset June 21 ~21:00-21:04.
+  it('Toronto summer — Sunset ~21:02 ±12min', () => {
    const t = getTimes(new Date('2024-06-21'), 43.6532, -79.3832, -4);
    assert(approx(t.Maghrib, hm(21,2), 0.22), `Got ${t.Maghrib}`);
-});
+  });

-test('Reykjavik summer — Sunrise and Maghrib finite', () => {
-  // ~64°N — high latitude, Midnight Sun territory
+  it('Reykjavik summer — Sunrise and Maghrib finite', () => {
    const t = getTimes(new Date('2024-06-21'), 64.1265, -21.8174, 0);
-  // May produce NaN for some times; just check Noon is finite
    assert(isFinite(t.Noon), `Noon should be finite`);
-});
+  });

-test('South pole winter — Noon finite', () => {
+  it('South pole winter — Noon finite', () => {
    const t = getTimes(new Date('2024-06-21'), -90, 0, 0);
-  // Extreme case — just should not throw
    assert(typeof t.Noon === 'number');
+  });
 });

 // ─────────────────────────────────────────────────────────────────────────────
 // Section 9: getTimes — seasonal variation at fixed location
 // ─────────────────────────────────────────────────────────────────────────────
-console.log('\n[9] getTimes — seasonal variation');
-
-test('NY Sunrise earlier in summer than winter', () => {
+describe('getTimes — seasonal variation', () => {
+  it('NY Sunrise earlier in summer than winter', () => {
    const summer = getTimes(new Date('2024-06-21'), 40.7, -74.0, -4).Sunrise;
    const winter = getTimes(new Date('2024-12-21'), 40.7, -74.0, -5).Sunrise;
    assert(summer < winter, `Summer ${summer} < Winter ${winter}`);
-});
+  });

-test('NY Sunset later in summer than winter', () => {
+  it('NY Sunset later in summer than winter', () => {
    const summer = getTimes(new Date('2024-06-21'), 40.7, -74.0, -4).Maghrib;
    const winter = getTimes(new Date('2024-12-21'), 40.7, -74.0, -5).Maghrib;
    assert(summer > winter, `Summer ${summer} > Winter ${winter}`);
-});
+  });

-test('Noon time consistent across seasons (same tz, within 30 min)', () => {
-  // Use EST (-5) for all dates to avoid EDT/EST offset masking the comparison.
-  // Equation of time spans ±16 min; NY longitude offset is fixed. Max variation ~30 min.
+  it('Noon time consistent across seasons (same tz, within 30 min)', () => {
    const base = getTimes(new Date('2024-06-21'), 40.7, -74.0, -5).Noon;
    for (const d of ['2024-01-15','2024-04-01','2024-09-22','2024-12-21']) {
      const t = getTimes(new Date(d), 40.7, -74.0, -5).Noon;
      assert(Math.abs(t - base) < 0.5, `Noon ${t} vs ${base} on ${d}`);
    }
-});
+  });

-test('Fajr angle smaller in London summer than London winter', () => {
+  it('Fajr angle smaller in London summer than London winter', () => {
    const summer = getAngles(new Date('2024-06-21'), 51.5, -0.1).fajrAngle;
    const winter = getAngles(new Date('2024-12-21'), 51.5, -0.1).fajrAngle;
    assert(summer < winter, `Summer ${summer} should be < Winter ${winter}`);
+  });
 });

 // ─────────────────────────────────────────────────────────────────────────────
 // Section 10: Hanafi vs Shafi'i
 // ─────────────────────────────────────────────────────────────────────────────
-console.log('\n[10] Asr convention');
-
-test('Hanafi Asr later than Shafii at multiple locations', () => {
+describe('Asr convention', () => {
+  it('Hanafi Asr later than Shafii at multiple locations', () => {
    const locations = [
-    [40.7, -74.0, -4],   // New York
-    [21.4, 39.8, 3],     // Makkah
-    [51.5, -0.1, 1],     // London
-    [-33.9, 151.2, 10],  // Sydney
+      [40.7, -74.0, -4],
+      [21.4, 39.8, 3],
+      [51.5, -0.1, 1],
+      [-33.9, 151.2, 10],
    ];
    for (const [lat, lng, tz] of locations) {
      const tS = getTimes(new Date('2024-06-21'), lat, lng, tz, 0, 15, 1013.25, false);
@ -491,140 +456,131 @@ test('Hanafi Asr later than Shafii at multiple locations', () => {
      assert(tH.Asr > tS.Asr,
        `Hanafi Asr (${tH.Asr}) should be > Shafi'i Asr (${tS.Asr}) at lat=${lat}`);
    }
-});
+  });

-test('Hanafi-Shafii difference 20-85 min at typical latitudes', () => {
-  // At high summer latitudes (long day), the shadow-ratio difference can reach ~75 min.
+  it('Hanafi-Shafii difference 20-85 min at typical latitudes', () => {
    const t = getTimes(new Date('2024-06-21'), 40.7, -74.0, -4);
    const tH = getTimes(new Date('2024-06-21'), 40.7, -74.0, -4, 0, 15, 1013.25, true);
    const diffMin = (tH.Asr - t.Asr) * 60;
    assert(diffMin > 20 && diffMin < 85, `Difference ${diffMin} min`);
+  });
 });

 // ─────────────────────────────────────────────────────────────────────────────
 // Section 11: Atmospheric parameters
 // ─────────────────────────────────────────────────────────────────────────────
-console.log('\n[11] Atmospheric parameters');
-
-test('Higher elevation brings Sunrise earlier', () => {
+describe('Atmospheric parameters', () => {
+  it('Higher elevation brings Sunrise earlier', () => {
    const t0 = getTimes(new Date('2024-06-21'), 40.7, -74.0, -4, 0);
    const t1 = getTimes(new Date('2024-06-21'), 40.7, -74.0, -4, 2000);
    assert(t1.Sunrise <= t0.Sunrise, `High-elevation sunrise (${t1.Sunrise}) should be <= sea level (${t0.Sunrise})`);
-});
+  });

-test('Temperature and pressure accepted without error', () => {
+  it('Temperature and pressure accepted without error', () => {
    const t = getTimes(new Date('2024-06-21'), 40.7, -74.0, -4, 100, 5, 950);
    assert(isFinite(t.Sunrise));
-});
+  });

-test('Extreme cold reduces refraction slightly', () => {
+  it('Extreme cold reduces refraction slightly', () => {
    const tHot = getTimes(new Date('2024-06-21'), 40.7, -74.0, -4, 0, 40, 1013.25);
    const tCold = getTimes(new Date('2024-06-21'), 40.7, -74.0, -4, 0, -20, 1013.25);
-  // Both should return finite values
    assert(isFinite(tHot.Sunrise) && isFinite(tCold.Sunrise));
+  });
 });

 // ─────────────────────────────────────────────────────────────────────────────
 // Section 12: calcTimes — formatted output
 // ─────────────────────────────────────────────────────────────────────────────
-console.log('\n[12] calcTimes — formatting');
-
-test('calcTimes returns HH:MM:SS strings', () => {
+describe('calcTimes — formatting', () => {
+  it('returns HH:MM:SS strings', () => {
    const t = calcTimes(new Date('2024-06-21'), 40.7, -74.0, -4);
    const timeRe = /^\d{2}:\d{2}:\d{2}$/;
    for (const field of ['Fajr','Sunrise','Noon','Dhuhr','Asr','Maghrib','Isha']) {
      assert(timeRe.test(t[field]), `${field}="${t[field]}" not HH:MM:SS`);
    }
-});
+  });

-test('calcTimes Qiyam returns HH:MM:SS or N/A', () => {
+  it('Qiyam returns HH:MM:SS or N/A', () => {
    const t = calcTimes(new Date('2024-06-21'), 40.7, -74.0, -4);
    assert(t.Qiyam === 'N/A' || /^\d{2}:\d{2}:\d{2}$/.test(t.Qiyam),
      `Qiyam="${t.Qiyam}"`);
-});
+  });

-test('calcTimes angles preserved correctly', () => {
+  it('angles preserved correctly', () => {
    const t = calcTimes(new Date('2024-06-21'), 40.7, -74.0, -4);
    assert(typeof t.angles.fajrAngle === 'number');
    assert(typeof t.angles.ishaAngle === 'number');
-});
+  });

-test('calcTimes default timezone matches getTimes', () => {
+  it('default timezone matches getTimes', () => {
    const date = new Date('2024-06-21T12:00:00.000Z');
    const raw = getTimes(date, 40.7, -74.0);
    const fmt = calcTimes(date, 40.7, -74.0);
-  // Sunrise should parse to same fractional hour
    const [h, m, s] = fmt.Sunrise.split(':').map(Number);
    const parsed = h + m / 60 + s / 3600;
    assert(approx(parsed, raw.Sunrise, 0.005), `Parsed ${parsed}, raw ${raw.Sunrise}`);
+  });
 });

 // ─────────────────────────────────────────────────────────────────────────────
 // Section 13: getTimesAll — method comparison
 // ─────────────────────────────────────────────────────────────────────────────
-console.log('\n[13] getTimesAll — method comparison');
-
-test('getTimesAll returns Methods map with 14 entries', () => {
+describe('getTimesAll — method comparison', () => {
+  it('returns Methods map with 14 entries', () => {
    const t = getTimesAll(new Date('2024-06-21'), 40.7, -74.0, -4);
    assert.strictEqual(Object.keys(t.Methods).length, 14);
-});
+  });

-test('getTimesAll Methods entries are [number, number]', () => {
+  it('Methods entries are [number, number]', () => {
    const t = getTimesAll(new Date('2024-06-21'), 40.7, -74.0, -4);
    for (const [id, [fajr, isha]] of Object.entries(t.Methods)) {
      assert(typeof fajr === 'number', `${id} fajr is not a number`);
      assert(typeof isha === 'number', `${id} isha is not a number`);
    }
-});
+  });

-test('getTimesAll ISNA Fajr is finite at NY summer', () => {
+  it('ISNA Fajr is finite at NY summer', () => {
    const t = getTimesAll(new Date('2024-06-21'), 40.7, -74.0, -4);
    assert(isFinite(t.Methods.ISNA[0]), `ISNA Fajr=${t.Methods.ISNA[0]}`);
-});
+  });

-test('getTimesAll MWL Isha at London summer may be NaN (18° fails)', () => {
+  it('MWL Isha at London summer may be NaN (18° fails)', () => {
    const t = getTimesAll(new Date('2024-06-21'), 51.5, -0.1, 1);
-  // MWL uses 17° Isha. London summer — may or may not reach it.
-  // Just verify it's a number (finite or NaN)
    assert(typeof t.Methods.MWL[1] === 'number');
-});
+  });

-test('getTimesAll UAQ Isha = Maghrib + 90min', () => {
+  it('UAQ Isha = Maghrib + 90min', () => {
    const t = getTimesAll(new Date('2024-06-21'), 21.4, 39.8, 3);
    const diff = (t.Methods.UAQ[1] - t.Maghrib) * 60;
    assert(approx(diff, 90, 2), `UAQ isha diff=${diff} min, expected 90`);
-});
+  });

-test('getTimesAll Qatar Isha = Maghrib + 90min', () => {
+  it('Qatar Isha = Maghrib + 90min', () => {
    const t = getTimesAll(new Date('2024-06-21'), 25.3, 51.5, 3);
    const diff = (t.Methods.Qatar[1] - t.Maghrib) * 60;
    assert(approx(diff, 90, 2), `Qatar isha diff=${diff} min, expected 90`);
-});
+  });

-test('getTimesAll higher-angle methods have earlier Fajr', () => {
-  // MUIS (20°) should give earlier Fajr than ISNA (15°)
+  it('higher-angle methods have earlier Fajr', () => {
    const t = getTimesAll(new Date('2024-06-21'), 1.3, 103.8, 8);
    const muis = t.Methods.MUIS[0];
    const isna = t.Methods.ISNA[0];
    if (isFinite(muis) && isFinite(isna)) {
      assert(muis < isna, `MUIS Fajr (${muis}) should be < ISNA Fajr (${isna})`);
    }
-});
+  });

-test('getTimesAll dynamic Fajr within method range', () => {
-  // Higher depression angle = earlier Fajr. Dynamic (14.8°) falls between 12° (UOIF, latest)
-  // and 18° (Karachi, earliest). So: Karachi[0] <= dynamic <= UOIF[0].
+  it('dynamic Fajr within method range', () => {
    const t = getTimesAll(new Date('2024-06-21'), 40.7, -74.0, -4);
-  const earliest = t.Methods.Karachi[0]; // 18° → earliest Fajr
-  const latest   = t.Methods.UOIF[0];   // 12° → latest Fajr
+    const earliest = t.Methods.Karachi[0];
+    const latest   = t.Methods.UOIF[0];
    if (isFinite(earliest) && isFinite(latest)) {
      assert(t.Fajr >= earliest - 0.10 && t.Fajr <= latest + 0.10,
        `Dynamic Fajr ${t.Fajr} not between Karachi=${earliest} and UOIF=${latest}`);
    }
-});
+  });

-test('getTimesAll MSC and dynamic are close', () => {
-  // MSC is the base for the dynamic method — they should be within ~20 minutes
+  it('MSC and dynamic are close', () => {
    const t = getTimesAll(new Date('2024-06-21'), 40.7, -74.0, -4);
    const mscFajr = t.Methods.MSC[0];
    const dynFajr = t.Fajr;
@ -632,83 +588,78 @@ test('getTimesAll MSC and dynamic are close', () => {
      const diffMin = Math.abs(mscFajr - dynFajr) * 60;
      assert(diffMin < 25, `MSC Fajr (${mscFajr}) vs Dynamic Fajr (${dynFajr}) = ${diffMin} min`);
    }
+  });
 });

 // ─────────────────────────────────────────────────────────────────────────────
 // Section 14: calcTimesAll — formatted all methods
 // ─────────────────────────────────────────────────────────────────────────────
-console.log('\n[14] calcTimesAll');
-
-test('calcTimesAll returns formatted strings', () => {
+describe('calcTimesAll', () => {
+  it('returns formatted strings', () => {
    const t = calcTimesAll(new Date('2024-06-21'), 40.7, -74.0, -4);
    const timeRe = /^\d{2}:\d{2}:\d{2}$/;
    assert(timeRe.test(t.Fajr), `Fajr="${t.Fajr}"`);
    assert(timeRe.test(t.Maghrib), `Maghrib="${t.Maghrib}"`);
-});
+  });

-test('calcTimesAll Methods entries are [string, string]', () => {
+  it('Methods entries are [string, string]', () => {
    const t = calcTimesAll(new Date('2024-06-21'), 40.7, -74.0, -4);
    for (const [id, [fajr, isha]] of Object.entries(t.Methods)) {
      assert(typeof fajr === 'string', `${id} fajr is not a string`);
      assert(typeof isha === 'string', `${id} isha is not a string`);
    }
-});
+  });

-test('calcTimesAll N/A for unreachable events', () => {
-  // At very high lat summer, some 18° methods may be N/A
+  it('N/A for unreachable events', () => {
    const t = calcTimesAll(new Date('2024-06-21'), 58.0, 25.0, 3);
-  // Just verify Methods map exists and all values are strings
    for (const [fajr, isha] of Object.values(t.Methods)) {
      assert(typeof fajr === 'string');
      assert(typeof isha === 'string');
    }
+  });
 });

 // ─────────────────────────────────────────────────────────────────────────────
 // Section 15: Multi-year and edge date coverage
 // ─────────────────────────────────────────────────────────────────────────────
-console.log('\n[15] Date coverage');
-
-test('Works across multiple years', () => {
+describe('Date coverage', () => {
+  it('works across multiple years', () => {
    for (const year of [2020, 2022, 2024, 2025, 2026]) {
      const t = getTimes(new Date(`${year}-06-21`), 40.7, -74.0, -4);
      assert(isFinite(t.Sunrise), `Year ${year} Sunrise not finite`);
    }
-});
+  });

-test('Works on Feb 29 in leap year', () => {
+  it('works on Feb 29 in leap year', () => {
    const t = getTimes(new Date('2024-02-29'), 40.7, -74.0, -5);
    assert(isFinite(t.Fajr), 'Feb 29 Fajr not finite');
-});
+  });

-test('Works on Dec 31', () => {
+  it('works on Dec 31', () => {
    const t = getTimes(new Date('2024-12-31'), 40.7, -74.0, -5);
    assert(isFinite(t.Sunrise));
-});
+  });

-test('Works on Jan 1', () => {
+  it('works on Jan 1', () => {
    const t = getTimes(new Date('2024-01-01'), 40.7, -74.0, -5);
    assert(isFinite(t.Sunrise));
-});
+  });

-test('Both equinoxes consistent', () => {
-  // NY 74°W, UTC-4 (EDT in both March 20 and Sep 22): solar noon ~12:56 EDT.
-  // At equinox, day ≈ 12h, sunrise ≈ noon − 6h ≈ 6:56 EDT.
+  it('both equinoxes consistent', () => {
    const t1 = getTimes(new Date('2024-03-20'), 40.7, -74.0, -4);
    const t2 = getTimes(new Date('2024-09-22'), 40.7, -74.0, -4);
    assert(approx(t1.Sunrise, hm(6,57), 0.30), `Spring equinox Sunrise ${t1.Sunrise}`);
    assert(approx(t2.Sunrise, hm(6,54), 0.30), `Autumn equinox Sunrise ${t2.Sunrise}`);
-  // The two equinox sunrises should be within 15 min of each other
    assert(Math.abs(t1.Sunrise - t2.Sunrise) < 0.25,
      `Equinox sunrises differ by ${Math.abs(t1.Sunrise - t2.Sunrise) * 60} min`);
+  });
 });

 // ─────────────────────────────────────────────────────────────────────────────
 // Section 16: Global coverage — additional locations
 // ─────────────────────────────────────────────────────────────────────────────
-console.log('\n[16] Global coverage');
-
-const globalLocations = [
+describe('Global coverage', () => {
+  const globalLocations = [
    { name: 'Dubai',     lat:  25.2048, lng:  55.2708, tz: 4,   date: '2024-06-21' },
    { name: 'Kuala Lumpur', lat: 3.1390, lng: 101.6869, tz: 8,  date: '2024-06-21' },
    { name: 'Paris',     lat:  48.8566, lng:   2.3522, tz: 2,   date: '2024-06-21' },
@ -719,56 +670,82 @@ const globalLocations = [
    { name: 'Oslo',      lat:  59.9139, lng:  10.7522, tz: 2,   date: '2024-06-21' },
    { name: 'Dhaka',     lat:  23.8103, lng:  90.4125, tz: 6,   date: '2024-06-21' },
    { name: 'Riyadh',    lat:  24.7136, lng:  46.6753, tz: 3,   date: '2024-06-21' },
-];
+  ];

-for (const loc of globalLocations) {
-  test(`${loc.name} — all times numeric`, () => {
+  for (const loc of globalLocations) {
+    it(`${loc.name} — all times numeric`, () => {
      const t = getTimes(new Date(loc.date), loc.lat, loc.lng, loc.tz);
      assert(typeof t.Fajr === 'number', `Fajr: ${t.Fajr}`);
      assert(typeof t.Noon === 'number', `Noon: ${t.Noon}`);
      assert(typeof t.Maghrib === 'number', `Maghrib: ${t.Maghrib}`);
    });
-}
+  }
+});

 // ─────────────────────────────────────────────────────────────────────────────
 // Section 17: Winter scenarios
 // ─────────────────────────────────────────────────────────────────────────────
-console.log('\n[17] Winter scenarios');
-
-test('London winter — all core times finite', () => {
+describe('Winter scenarios', () => {
+  it('London winter — all core times finite', () => {
    const t = getTimes(new Date('2024-12-21'), 51.5, -0.1, 0);
    for (const f of ['Fajr','Sunrise','Noon','Dhuhr','Asr','Maghrib','Isha']) {
      assert(isFinite(t[f]), `${f}=${t[f]}`);
    }
-});
+  });

-test('Moscow winter — all core times finite', () => {
+  it('Moscow winter — all core times finite', () => {
    const t = getTimes(new Date('2024-12-21'), 55.8, 37.6, 3);
    for (const f of ['Fajr','Sunrise','Noon','Dhuhr','Asr','Maghrib','Isha']) {
      assert(isFinite(t[f]), `${f}=${t[f]}`);
    }
-});
+  });

-test('Oslo winter — Noon finite', () => {
+  it('Oslo winter — Noon finite', () => {
    const t = getTimes(new Date('2024-12-21'), 59.9, 10.8, 1);
    assert(isFinite(t.Noon));
-});
+  });

-test('Oslo winter — Sunrise, Sunset near solstice values', () => {
+  it('Oslo winter — Sunrise, Sunset near solstice values', () => {
    const t = getTimes(new Date('2024-12-21'), 59.9, 10.8, 1);
-  // Oslo Dec 21: Sunrise ~09:18, Sunset ~15:12
    if (isFinite(t.Sunrise)) {
      assert(approx(t.Sunrise, hm(9,18), 0.25), `Oslo Sunrise ${t.Sunrise}`);
    }
+  });
 });

 // ─────────────────────────────────────────────────────────────────────────────
-// Summary
+// Section 18: Input validation
 // ─────────────────────────────────────────────────────────────────────────────
-const total = passed + failed;
-console.log(`\n${'─'.repeat(50)}`);
-console.log(`${passed}/${total} tests passed`);
+describe('Input validation', () => {
+  it('rejects latitude > 90', () => {
+    assert.throws(() => getTimes(new Date('2024-06-21'), 91, 0, 0), { name: 'RangeError' });
+  });

-if (failed > 0) {
-  process.exit(1);
-}
+  it('rejects latitude < -90', () => {
+    assert.throws(() => getTimes(new Date('2024-06-21'), -91, 0, 0), { name: 'RangeError' });
+  });
+
+  it('rejects longitude > 180', () => {
+    assert.throws(() => getTimes(new Date('2024-06-21'), 0, 181, 0), { name: 'RangeError' });
+  });
+
+  it('rejects longitude < -180', () => {
+    assert.throws(() => getTimes(new Date('2024-06-21'), 0, -181, 0), { name: 'RangeError' });
+  });
+
+  it('rejects timezone > 14', () => {
+    assert.throws(() => getTimes(new Date('2024-06-21'), 0, 0, 15), { name: 'RangeError' });
+  });
+
+  it('rejects NaN latitude', () => {
+    assert.throws(() => getTimes(new Date('2024-06-21'), NaN, 0, 0), { name: 'RangeError' });
+  });
+
+  it('rejects Infinity longitude', () => {
+    assert.throws(() => getTimes(new Date('2024-06-21'), 0, Infinity, 0), { name: 'RangeError' });
+  });
+
+  it('getTimesAll also validates', () => {
+    assert.throws(() => getTimesAll(new Date('2024-06-21'), 91, 0, 0), { name: 'RangeError' });
+  });
+});
--- a/tsconfig.json
+++ b/tsconfig.json
@ -4,6 +4,8 @@
    "module": "ESNext",
    "moduleResolution": "bundler",
    "strict": true,
+    "noImplicitReturns": true,
+    "noFallthroughCasesInSwitch": true,
    "esModuleInterop": true,
    "declaration": true,
    "declarationMap": true,