StarGazer names the stars, planets, Sun and Moon in the direction the camera is pointed.
3,249 stars, to visual magnitude 5.60, from the Yale Bright Star Catalogue, 5th Revised Edition (Dorrit Hoffleit & Wayne H. Warren Jr., 1991; VizieR V/50). Positions are for equinox and epoch J2000. The count and the coordinates match that catalogue (Sirius is 06h 45m 08.9s, −16° 42′ 58″, V = −1.46).
Names are the traditional names and those approved by the IAU (Working Group on Star Names and NameExoWorlds). A few components keep a Bayer designation, such as α² Cen. Colours are indicative tints taken from the catalogue’s colour index and spectral type.
Positions and brightness are computed with Astronomy Engine (Don Cross, MIT). The planets use VSOP87, the theory of Pierre Bretagnon and Gérard Francou (Bureau des longitudes / IMCCE, 1988). The Moon follows E. W. Brown’s lunar theory as given in the Nautical Almanac Office’s Improved Lunar Ephemeris (1954), through Montenbruck & Pfleger, Astronomy on the Personal Computer. ΔT uses the Espenak & Meeus polynomials (NASA GSFC). The lunar disc uses a radius of 1,737.4 km.
Magnetic declination is the World Magnetic Model of NOAA / NCEI and the British Geological Survey: WMM2015, WMM2015v2, WMM2020 and WMM2025.
The stick figures — Ursa Major, Cassiopeia, Orion, the Summer Triangle, the Southern Cross and the other labelled patterns — are drawn in the app. They are not the IAU constellation boundaries.
2026 Nicolas Denimal – letal.denimal.ovh