Predicting the ISS From a TLE: A Worked Example
Two lines of 1960s punch-card text are enough to predict where the ISS will be tonight. Here is the maths, the arithmetic, and why it expires.
May 28, 2026
20 min read
Posts tagged "sgp4"
2 posts on issinfo.net tagged with sgp4.
Tracking the ISS: Why Its Orbit, Altitude and Speed Constantly Change
The International Space Station's altitude, speed and ground track all change in real time. The physics behind those wiggling lines on a live tracker.
July 18, 2025
16 min read