Your sensors measure where you aim, astronomy does the rest: the reticle names the
star — 330 named stars (official IAU list), 5,000 field stars, 110 Messier objects (nebulae, clusters, galaxies), planets, Sun and Moon. Right in your browser.
Your phone will ask for 3 permissions — accept them:
🧭 Orientation (to measure direction) · 📷 Camera (the viewfinder —
nothing recorded or sent) · 📍 Location (the sky depends on where you are).
💡 Phone compasses can be a few degrees off:
if the name seems shifted, sweep slowly around the star — the right name is the one that
stays closest. For instrument-grade precision, calibrate below on a named star.
🔭 Binoculars mode — loads 36,000 extra stars (down to magnitude 8.5, visible with 50mm binoculars), about 200 KB. Enable
Three doors: here 🔭 Sky names the star you point at;
📡 Witness measures something that moves.
🖥️ Photo or video to measure on a PC?
VigiSky Sentinel
(Windows, 100% local) — the same astrometry, as a desktop station.