If labels drift away from real objects near the screen edges, adjust this until they line up.
Compass
Location
Planets, Sun and Moon: Astronomy Engine (VSOP87, ±1″). Asteroids: today's NASA/JPL Horizons elements. Satellites: SGP4 on CelesTrak TLEs, recomputed every frame. Stars and distances: Hipparcos via d3-celestial and the HYG database (CC BY-SA 4.0). Pointing accuracy depends on your phone's compass (typically ±5–10°); tap Align on a known object to correct it.
SkyTrackerAR
Point your phone at the sky. See every planet, star, asteroid and satellite, including the ISS and Starlink, moving live.
10,000+ live satellites
±1″ planet accuracy
NASA/JPL asteroid orbits
Uses your camera, motion sensors and location. Nothing leaves your device.