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• v0.16.0 46c8a30575

  Add v0.16.0: twilight dawn/dusk, lunar phase, planet apparent magnitude

  rsp2k released this 2026-02-26 19:42:01 +00:00 | 48 commits to main since this release

  Twilight: 6 functions (civil/nautical/astronomical × dawn/dusk) reusing
  the existing find_next_crossing() bisection search with Sun depression
  angle thresholds (-6°, -12°, -18°). Returns NULL for polar regions
  where the threshold is never reached.

  Lunar phase: 4 functions computing Sun-Earth-Moon geometry from VSOP87

  • ELP2000-82B. Phase angle [0,360) via elongation + cross product
    z-component for waxing/waning discrimination. 8 named phases in 45°
    bins. Moon age approximated from phase angle and mean synodic month.

  Planet magnitude: Mallama & Hilton (2018) polynomial model with VSOP87
  heliocentric distances and phase angle via law of cosines. All 7
  planets (Mercury-Neptune, excluding Earth). Saturn ring tilt not
  modeled.

  151 → 162 SQL objects. 26 → 27 test suites, all passing.

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