Space Time
Catch the next ISS pass
Visible passes of the ISS, Tiangong and Hubble, computed for your location from current orbital data. Pick one and jump the clock to watch it go over.
🚀 Find the next ISS pass Free · Real orbital data · No account
Real passes, from real orbital data
Space Time pulls current two-line element sets and runs them through the SGP4 propagator, the same model used for actual satellite tracking. That gives you reliable predictions of when the ISS, Tiangong and Hubble will be visible from where you live. Pick a pass and the simulation clock jumps to it, so you can preview the track across your sky before you head out.
Ride along in orbit
Predicting passes is half of it. You can also bolt the camera to the ISS, Hubble, JWST or the Parker Solar Probe and look back at Earth and the Sun, with the velocity readout in real km/s.
See the whole swarm
Beyond the handful of bright passes, you can switch on the full live Celestrak catalog, about 9,000 active satellites, and watch them orbit Earth in real time. Fly close and the low-orbit shell fills in, the dense Starlink bands and all, every point propagated from real orbital elements. Search any satellite by name or NORAD number to pin a marker on it.
FAQ
When can I see the ISS?
Visible ISS passes are predicted for your location with real TLE + SGP4 data, and you can jump the clock to a pass.
Which satellites can I track?
Visible passes are predicted for the ISS, Tiangong and Hubble. Separately, you can turn on the full live Celestrak catalog, about 9,000 active satellites, and watch the whole swarm orbit Earth in real time, then search any one by name or NORAD number.
Is the data real?
Yes: real TLE data run through the SGP4 propagator, not an approximation.
Is it free?
Yes. In your browser, no account, no download.