Seven hundred real satellites, where they are right now. Orbits computed on this phone from public NORAD elements — nothing fetched, nothing sent.
White dots are low orbit — the ISS, Hubble, the bright ones. Gold is the geostationary belt, where SES and Astra sit. The red mark is GRIDX in Wickrange.
Low-orbit satellites rising more than 10° above the horizon at GRIDX in the next 24 hours. Local time. Tap one to put it on the globe.
Two-line element sets from CelesTrak — the same public NORAD data every tracker uses. They travel inside the page, so it works in a hall without Wi-Fi. They age: a week on, low orbits drift by kilometres, so the date is shown.
⌁SGP4, the propagator NORAD elements are made for, ported by hand and checked against the reference implementation: low orbits agree to a metre a week out. The geostationary belt uses a Keplerian orbit and drifts 15 km a day from the reference — under one pixel here.
◫No server, no account, no request after the page is open. Positions, passes and the globe are computed by your browser. Install it and it works offline.
↗Altitudes are compressed: low orbits sit just above the surface, the geostationary belt is drawn at a third of its real distance.