aric/moon-sighting
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moon-sighting/CHANGELOG.md
Aric Camarata b46ba2a74c Initial release: moon-calc v1.0.0 
High-accuracy lunar crescent visibility using JPL DE442S ephemerides.
Implements Yallop q-test and Odeh V-parameter with all five crescent
geometry quantities (ARCL, ARCV, DAZ, W, lag). Full time scale chain
(UTC → TDB), IERS Q·R·W frame transforms, WGS84 observer model,
Bennett refraction, and kernel-free moon phase via Meeus approximation.
2026-02-25 15:45:41 -05:00

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Changelog

All notable changes to moon-calc are documented here. Format follows Keep a Changelog.

[1.0.0] - 2026-02-25

Added

  • Core type system: Observer, MoonSightingReport, CrescentGeometry, YallopResult, OdehResult, MoonPhaseResult, SunMoonEvents, KernelConfig, SightingOptions
  • Module architecture: math/, time/, spk/, frames/, observer/, bodies/, events/, visibility/, api/, cli/
  • DAF/SPK Type 2 parser and Chebyshev evaluator for DE442S
  • Kernel auto-download and SHA-256 checksum verification (initKernels, downloadKernels, verifyKernels)
  • Full time scale chain: UTC → TAI → TT → TDB with delta-T polynomial, leap-second table, ERA computation
  • IERS Q·R·W frame transforms: IAU 2006/2000A precession, nutation, polar motion
  • WGS84 geodetic ↔ ECEF conversion, topocentric ENU projection
  • Bennett (1982) atmospheric refraction formula with pressure/temperature correction
  • Topocentric Moon/Sun state computation via DE442S segment chaining
  • Meeus approximate positions for kernel-free getMoonPhase()
  • Rise/set event solver using Brent's method over the altitude function
  • Twilight computation: civil (−6°), nautical (−12°), astronomical (−18°)
  • Full crescent geometry: ARCL, ARCV, DAZ, W (arc minutes), lag
  • Yallop q-test constants and category thresholds (NAO TN 69)
  • Odeh zone constants, V-parameter thresholds, and best-time optimizer (Experimental Astronomy 2006)
  • WGS84 ellipsoid constants and Clenshaw Chebyshev evaluation
  • Vector/matrix math utilities, Brent root-finding
  • Best-time heuristic: T_b = T_sunset + (4/9) × Lag
  • Observation window computation (±20 min around best time)
  • Odeh-based and Yallop-based guidance text generation
  • getMoonSightingReport() full pipeline
  • getMoonPhase() (Meeus approximation, kernel-free)
  • getSunMoonEvents() full pipeline
  • CLI commands: download-kernels, verify-kernels, sighting, phase, benchmark
  • CI: Node matrix (20/22/24), typecheck, pack-check
  • Wiki: Architecture, API Reference, Crescent Visibility, Ephemeris, Time Scales, Reference Frames, Observer Model, Validation, Getting Started