Pass timing uses geometric sunlight and a 10° horizon. Weather and apparent brightness are not modelled, so a sunlit pass is an opportunity rather than a promise.
| Elements | Public GP elements from Space-Track.org and USSPACECOM |
|---|---|
| Cross-check | An independent CelesTrak set, compared before any release ships |
| Propagator | Vallado-compatible SGP4/SDP4, verified against the published reference vectors |
| Updates | Signed catalogue snapshots, every byte checked before replacing the one you have |
| Passes | Geometric sunlight, 10° horizon, any observing place on Earth |
| Imagery | Earth imagery courtesy of NASA |
Data provided by Space-Track.org and USSPACECOM. Validation data provided by CelesTrak, Dr. T.S. Kelso. Earth imagery courtesy of NASA.
No. The catalogue ships inside the app and positions are propagated on the device, so the globe works offline from the first launch. A connection is only used to fetch a newer catalogue snapshot, and every update is signed and checked byte by byte before it replaces the one you have.
They come from public General Perturbations elements run through SGP4/SDP4, the same model the industry uses. Accuracy degrades as the elements age and can differ by kilometres, which is why every screen states which snapshot it is using and how old it is. It is an educational atlas, not a conjunction assessment or antenna-pointing tool.
Yes - rise, peak and set with azimuth and elevation, for the Station, Tiangong and Hubble in the free app. A pass only counts when the object is sunlit and your sky is dark, and the horizon is taken at 10°. Weather and apparent brightness are not modelled, so treat a sunlit pass as an opportunity rather than a promise.
iPhone and iPad on iOS 18, Mac on macOS 15, Apple TV on tvOS 15 and Apple Vision Pro on visionOS 2.0 or later. With Premium, lesson progress, observing places and display settings sync through iCloud.
The free atlas is complete: the whole globe, the entire catalogue, search, orbit paths, and passes for the Station, Tiangong and Hubble. Premium opens all 54 Academy lessons, every constellation, the full Orbital Lens, seven-day forecasts from up to ten saved places, pass notifications, every spacecraft model, the time machine and iCloud sync. See the Orbit Map help page.
Public GP elements from Space-Track.org and USSPACECOM, cross-checked against an independent CelesTrak set before a release ships. Earth imagery courtesy of NASA.
Yes. The Academy has 54 lessons and more than eight hours across nine modules, from orbital mechanics and reading element sets to debris and data literacy. Each lesson carries numbers you can check in the inspector and two tasks to do on the globe. Premium opens all 54 lessons.
Because positions come from orbital elements measured at a particular moment, and their accuracy falls as that moment recedes - fastest for low orbits. Knowing the age of your data is part of reading it. See what a TLE is.
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Tap the three-dot menu at the top right, then choose Open in external browser.