QUIZZMAN ASTRO
Planetarium & calendrics — VSOP87D · ELPMPP02 · DE440 · Sky Viewer · Docs.
Astronomy glossary
Coordinates, angles, time, zodiac, and the 88 constellations — plain-language notes.
Sky Viewer guide
2D / 3D controls, layers, Observation Center, shortcuts.
API reference
/viewer/sky · /astro/day-sky · zodiac-support · health.
Audit paper
Level-3 accuracy notes · NASA / JPL / IAU benchmarks.