3 ms·
Was expecting social media, al la seveneves, but that is much better. I wonder where the data comes from?
by richk449 7y ago
Was expecting social media, al la seveneves, but that is much better. I wonder where the data comes from?
- chrissng 7y agoI might be wrong, but I don't think they are data captured in real-time. Based on a cursory understanding of the AGI STK, these satellite positions are calculated from ephemeris data which are updated on a regular basis (e.g. weekly). https://en.wikipedia.org/wiki/Ephemeris https://en.wikipedia.org/wiki/Ephemeris
- modeless 7y agoThe ephemeris data is updated approximately daily and also allows you to predict the satellite's position fairly accurately several days in the future. Satellites change orbits very infrequently, so it's close enough to real time for most purposes.
- scjosh 7y agoMost of the data is typically in a two-line element format [0]. You can grab it here https://www.space-track.org https://www.space-track.org or here https://celestrak.com/NORAD/elements/ https://celestrak.com/NORAD/elements/ (although I believe the celestrak data comes from space-track, correct me if I'm wrong) The satellite positions are then estimated using an algorithm such as sgp4 implemented in quite a few languages: * https://github.com/joshuaferrara/go-satellite https://github.com/joshuaferrara/go-satellite (<-- disclaimer: this is mine) * https://github.com/brandon-rhodes/python-sgp4 https://github.com/brandon-rhodes/python-sgp4 * https://github.com/shashwatak/satellite-js https://github.com/shashwatak/satellite-js Check out Dr. Kelso's (he works for AGI now) original work here in Pascal, plus a few links to C++ works: https://celestrak.com/software/tskelso-sw.php https://celestrak.com/software/tskelso-sw.php [0] https://celestrak.com/columns/v04n03/ https://celestrak.com/columns/v04n03/