SALAH — prayer times for Casablanca (Xiaomi Watch S4)

Offline prayer-time companion: shows today's six times (FAJR, SHURUK, DHUHR, ASR, MAGHRIB, ISHA) with the next prayer highlighted and a countdown banner.

Status: VERIFIED MATH (matches AlAdhan on 3 reference dates); on-watch render pending user confirmation.

Method

Morocco (Ministry of Habous), matching AlAdhan method=21:

Fajr 19°, Isha 17° (twilight angles)
Standard Asr (shadow factor 1× — Maliki default in Morocco)
Dhuhr = solar noon + 5 min; Maghrib = sunset + 5 min (AlAdhan's baked offsets)
Location hardcoded: Casablanca 33.5731, −7.5898 · fixed TZ = UTC+1. Ramadan clock changes are not handled by this version.

All computation happens on the watch — no GPS, no network. Pure solar math (same Meeus approach as the sundial) lives in src/common/prayer.js.

Screen (v0.5)

Pure #000000 AMOLED background, large 50px clock, no swipe hint
Prayer names above their times, in fixed 104px native list rows
After scrolling stops, the nearest-center prayer gets a 60px time and 28px label; other rows use 30px times and 20px labels
No font resizing or row-array replacement during gesture/inertial scrolling
Duplicate stop notifications do not repaint unchanged focus; periodic refresh defers while scrolling and resumes normally after hiding/showing the app
Scroll viewport 320×264 at x73/y101 (center y233); 80px end spacers
Fixed countdown below the list; lavender next-prayer highlight
Normal system back exits; calculation logic unchanged

User reported watch lag in v0.4. A 500-event VM replay measured 500 row-array replacements in v0.4 versus zero during scrolling in v0.5. This verifies reduced update work, NOT device frame rate. All automated tests and release build pass; on-watch smoothness still needs confirmation. preview-0.4.png remains an illustrative static layout mock; the settled appearance is unchanged.

Project layout

src/
├── app.ux, manifest.json   # com.ilias.salah, watch, designWidth 466
├── common/
│   ├── prayer.js           # times/format/nextPrayer/formatCountdown — pure, unit-tested
│   └── icon.png            # 192×192 circular icon (user-supplied mosque art)
└── pages/index/index.ux    # layout + update loop
tests/
├── prayer.cjs              # 10 tests vs AlAdhan reference times (3 dates)
├── page.cjs                # 11 wiring/layout tests (incl. chord-fit assertions)
├── make_icon.py            # icon conversion pipeline (disc detect → round mask → 192²)
└── check-rpk.py            # verifies icon/manifest inside the built .rpk

Build & test

npm ci
npm run release
node tests/prayer.cjs
node tests/page.cjs
node tests/amoled.cjs
node tests/focus.cjs
node tests/scroll-performance.cjs

Install

Side-load dist/com.ilias.salah.release.*.rpk via AstroBox. Releases: https://gitea.oimcloud.myaddr.tools/codex-bot/vela-salah

Accuracy note

Verified against AlAdhan API (method 21) for 2026-09-09, 2026-01-15, 2026-07-01 — all six times within 2 minutes on every date. Tolerance covers the low-precision solar vector (±0.01°) plus rounding.

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