Data sources & licenses
Everything the site computes comes from public data. This is the list.
| Source | Used for | License / terms | Status |
|---|---|---|---|
| Space-Track.org (USSPACECOM) | Orbital elements (TLEs) | User agreement; data credited to USSPACECOM | ok Oct 28, 2026, 10:22 PM UTC · 1257 items |
| CelesTrak | Orbital elements fallback | Free; polite fetch cadence | ok Oct 28, 2026, 10:22 PM UTC · 1257 items |
| Launch Library 2 (The Space Devs) | Launch schedule and pads | Free API tier, 15 requests/hour | ok Oct 28, 2026, 10:22 PM UTC · 10 items |
| NOAA SWPC | Planetary Kp | US government, public domain | ok Oct 28, 2026, 10:22 PM UTC · 63 items |
| GFZ Potsdam | Historical Kp | CC BY 4.0 | on demand |
| NOAA NWS | US weather observations | US government, public domain | ok Oct 28, 2026, 9:07 PM UTC |
| Open-Meteo | Weather outside the US, cloud forecasts | CC BY 4.0; free non-commercial API tier | ok Oct 28, 2026, 9:07 PM UTC |
| adsb.lol | Live aircraft positions | ODbL | off |
| astronomy-engine, satellite.js | Positions and propagation | MIT | built in |
Open-Meteo and adsb.lol count advertising and subscriptions as commercial use. The site runs without either; if that changes, these adapters are swapped first.