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ZeusWatch v1.21.1

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@SysAdminDoc SysAdminDoc released this 19 May 03:04
· 73 commits to main since this release
v1.21.1
3a440d2

Bug-fix release: real moon astronomy + southern-hemisphere visualization.

Fixed

  • Moon rise/set + illumination wildly off vs Jean Meeus astronomical algorithm (#16) — The previous estimateMoonTime returned a location-independent 18:00-anchored time drifted only by lunar age. Real moonrise/moonset depend on the observer's latitude, longitude, and the moon's declination. Replaced with MoonAstronomy.kt: Meeus-style geocentric position model (Ch. 47), moonrise/moonset solved by hourly altitude-curve sampling and linear interpolation through the h0 = +0.125° horizon (parallax + semi-diameter absorbed per Meeus § 15). Returns explicit alwaysUp / alwaysDown for polar latitudes. Illumination now uses the Meeus 48 phase-angle formula (1 + cos i) / 2 with actual Sun-Earth-Moon geometry.
  • Moon visualization upside-down for southern-hemisphere observers (#16) — The terminator was always rendered on the right side for waxing phases (northern view). Sydney / Buenos Aires observers actually see the moon rotated 180° relative to the northern view, and the app's forced-northern rendering was the bug — not the southern view being 'upside down'. Fixed by XOR-ing the waxing/waning bias with latitude < 0.

Install

Sideload ZeusWatch-v1.21.1.apk from the release assets. Same signing key as v1.21.0 — in-place upgrade works.

Assets 7
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