Hacker News new | ask | show | jobs
by Loic 3477 days ago
The cited Wikipedia page links to a wonderful SVG animation[0] comparing the orbit levels (do we say altitude?) and speed of GPS, GLONASS and Galileo.

[0]: https://upload.wikimedia.org/wikipedia/commons/b/b4/Comparis...
1 comments
joosters 3477 days ago
Is there a reason why GPS has an orbital period exactly half of that of a geostationary orbit?
link
Rebelgecko 3477 days ago
It means that the satellite will be in the same place at the same time every day (give or take about a hundred miles per day of drift)
link