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-# pray-calc — PRI (Per-Repo Instructions)
-
-**Cascade:** GCI → ASI → PPI (`/Volumes/X9/Sites/acamarata/.claude/CLAUDE.md`) → **PRI (this file)**
-
-## What This Is
-
-High-precision Islamic prayer times calculator in TypeScript. Computes Fajr, Dhuhr, Asr,
-Maghrib, Isha, Qiyam, Sunrise, and solar Noon for any location on Earth. Uses a physics-
-grounded dynamic twilight angle algorithm as the primary method. Includes 14 traditional
-fixed-angle methods for direct comparison.
-
-**npm:** `pray-calc@2.1.0`
-**Language:** TypeScript source → dual CJS/ESM build (tsup)
-**Node requirement:** >=20
-**License:** MIT
-
-## Dependencies
-
-- **nrel-spa** (^2.0.1) — NREL Solar Position Algorithm (zero-dep, sync, acamarata's own)
-- No moon dependency. Moon data: use `moon-sighting` package.
-
-Dev: @types/node, tsup, typescript
-
-## v2 API Surface
-
-```typescript
-// Core functions
-getTimes(date, lat, lng, tz?, elevation?, temperature?, pressure?, hanafi?): PrayerTimes
-calcTimes(...): FormattedPrayerTimes
-getTimesAll(...): PrayerTimesAll
-calcTimesAll(...): FormattedPrayerTimesAll
-
-// Low-level
-getAngles(date, lat, lng, elevation?, temperature?, pressure?): TwilightAngles
-getAsr(solarNoon, latitude, declination, hanafi?): number
-getQiyam(fajrTime, ishaTime): number
-getMscFajr(date, latitude): number          // minutes before sunrise
-getMscIsha(date, latitude, shafaq?): number // minutes after sunset
-
-// Ephemeris
-solarEphemeris(jd): { decl, r, eclLon }
-toJulianDate(date): number
-
-// Reference data
-METHODS: MethodDefinition[]
-```
-
-`nrel-spa` API (v2.x): `getSpa(date, lat, lng, tz, opts, zeniths)` and `formatTime(h)`
-Note: `fractalTime` was renamed to `formatTime` in v2.0.0. `fractalTime` does not exist.
-
-## Module Structure
-
-```
-src/
-├── index.ts               Main exports
-├── types.ts               All TypeScript types
-├── getSolarEphemeris.ts   Jean Meeus Ch. 25 — decl, r, eclLon
-├── getMSC.ts              MSC piecewise seasonal model
-├── getAngles.ts           Dynamic angle algorithm (3 layers)
-├── getAsr.ts              Pure-math Asr (no SPA dependency)
-├── getQiyam.ts            Last-third-of-night
-├── getTimes.ts            Raw fractional-hour output
-├── calcTimes.ts           Formatted HH:MM:SS output
-├── getTimesAll.ts         All-methods batch SPA call
-└── calcTimesAll.ts        All-methods formatted output
-```
-
-## Domain Reference
-
-Algorithm math, method angle table, and astronomical research facts:
- — load when working on angle calculations or method constants.
-
-## getSpa Batch Pattern
-
-`getTimesAll` uses one SPA call for all 14×2 + 2 dynamic zenith angles:
-
-```typescript
-allZeniths = [90+fajrAngle, 90+ishaAngle, ...methodZeniths]
-// methodZeniths: 14 methods × 2 = 28 entries
-// Methods with null ishaAngle get placeholder 90+18 (overridden post-call)
-spaData.angles[0].sunrise  → dynamic Fajr
-spaData.angles[1].sunset   → dynamic Isha
-spaData.angles[2+i*2].sunrise → method[i] Fajr
-spaData.angles[2+i*2+1].sunset → method[i] Isha (if angle-based)
-```
-
-## Commands
-
-- `pnpm build` — tsup dual CJS/ESM build
-- `pnpm run typecheck` — tsc --noEmit
-- `pnpm test` — build + node test.mjs + node test-cjs.cjs (94 ESM + 12 CJS = 106 tests)
-
-## Version History
-
-- **v2.0.0** — TypeScript rewrite, 14 methods, physics corrections, no suncalc, no moon
-- **v1.7.2** — Last CJS version with moon functions (getMoon, getMoonPhase, etc.)
-- Moon functions migrated to `moon-sighting` package
-
-## Moon Migration
-
-All moon functions removed from v2. Users should:
-
-```bash
-pnpm add moon-sighting
-```
-
-Map: `getMoon` → `getMoon`, `getMoonPhase` → `getMoonPhase`, etc.
-See `.github/wiki/Moon-Migration.md` for full table. moon-sighting uses Meeus Ch.47/48 +
-Odeh 2006 visibility, no suncalc dependency.
-
-## Related
-
-- nrel-spa: `~/Sites/acamarata/nrel-spa/` — solar foundation
-- moon-sighting: `~/Sites/acamarata/moon-sighting/` — lunar data
-- praycalc.com — live demo
-- praycalc.net — documentation site