SGP4/SDP4 Propagation Accuracy

Cross-platform orbital propagation validation against reference TLEs

Yes, we test this obsessively — and yes, we publish our homework below. But honesty first: SGP4 is only ever as good as the TLE it's fed, and this is v1.0. If you catch a satellite somewhere it clearly isn't, that's a bug we want to squash, not a number we're hiding. Tell us what looks off.