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Changelog

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

[1.1.0] - 2026-02-25

Added

  • getMoonPosition(date, lat, lon, elevation?): topocentric Moon azimuth, altitude, distance, and parallactic angle via Meeus Ch. 47 (no kernel required, ~0.3° accuracy)
  • getMoonIllumination(date): illumination fraction, phase cycle position, bright limb position angle, and waxing/waning flag via Meeus Ch. 47/48 (no kernel required)
  • getMoonVisibilityEstimate(date, lat, lon, elevation?): quick kernel-free Odeh crescent visibility estimate using Meeus positions; returns V parameter, zone (A-D), ARCL, ARCV, W
  • getMoon(date, lat, lon, elevation?): combined convenience wrapper returning phase, position, illumination, and visibility estimate in a single call
  • phaseName and phaseSymbol fields on MoonPhaseResult: human-readable name (e.g. "Waxing Crescent") and moon phase emoji (e.g. "🌒")
  • MoonPosition, MoonIlluminationResult, MoonVisibilityEstimate, and MoonSnapshot TypeScript types

[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