Open data
TLEs, ephemerides, and a public API.
The sky, as data
Everything we track, we publish. TLEs, ephemerides, pass predictions, and a public API — free, with attribution.
What's open
tle the raw orbital elements ephemeris position/velocity at any epoch passes computed for any location api REST, rate-limited, documented
Why open
The sky belongs to everyone. The only way to make that true is to give the data away — so students, hobbyists, and rivals can all build on the same ground truth.