Data and algorithms
SGP4 模型
SGP4
A simplified perturbation model that propagates a TLE.
This site computes pass times in your browser with SGP4.
Related terms
- Delta T — The mismatch between atomic and Earth-rotation time.
- Sidereal time — Time measured against the vernal equinox.
- Light-year — Distance light travels in a year, 9.46 trillion km.
- Astronomical unit — Earth–Sun mean distance, 149.6 million km.