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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.
35 lines
2.1 KiB
Markdown
35 lines
2.1 KiB
Markdown
# Changelog
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All notable changes to moon-calc are documented here.
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Format follows [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
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## [1.0.0] - 2026-02-25
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### Added
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- Core type system: `Observer`, `MoonSightingReport`, `CrescentGeometry`, `YallopResult`, `OdehResult`, `MoonPhaseResult`, `SunMoonEvents`, `KernelConfig`, `SightingOptions`
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- Module architecture: `math/`, `time/`, `spk/`, `frames/`, `observer/`, `bodies/`, `events/`, `visibility/`, `api/`, `cli/`
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- DAF/SPK Type 2 parser and Chebyshev evaluator for DE442S
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- Kernel auto-download and SHA-256 checksum verification (`initKernels`, `downloadKernels`, `verifyKernels`)
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- Full time scale chain: UTC → TAI → TT → TDB with delta-T polynomial, leap-second table, ERA computation
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- IERS Q·R·W frame transforms: IAU 2006/2000A precession, nutation, polar motion
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- WGS84 geodetic ↔ ECEF conversion, topocentric ENU projection
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- Bennett (1982) atmospheric refraction formula with pressure/temperature correction
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- Topocentric Moon/Sun state computation via DE442S segment chaining
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- Meeus approximate positions for kernel-free `getMoonPhase()`
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- Rise/set event solver using Brent's method over the altitude function
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- Twilight computation: civil (−6°), nautical (−12°), astronomical (−18°)
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- Full crescent geometry: ARCL, ARCV, DAZ, W (arc minutes), lag
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- Yallop q-test constants and category thresholds (NAO TN 69)
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- Odeh zone constants, V-parameter thresholds, and best-time optimizer (Experimental Astronomy 2006)
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- WGS84 ellipsoid constants and Clenshaw Chebyshev evaluation
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- Vector/matrix math utilities, Brent root-finding
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- Best-time heuristic: T_b = T_sunset + (4/9) × Lag
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- Observation window computation (±20 min around best time)
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- Odeh-based and Yallop-based guidance text generation
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- `getMoonSightingReport()` full pipeline
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- `getMoonPhase()` (Meeus approximation, kernel-free)
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- `getSunMoonEvents()` full pipeline
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- CLI commands: `download-kernels`, `verify-kernels`, `sighting`, `phase`, `benchmark`
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- CI: Node matrix (20/22/24), typecheck, pack-check
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- Wiki: Architecture, API Reference, Crescent Visibility, Ephemeris, Time Scales, Reference Frames, Observer Model, Validation, Getting Started
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