By now, any Earth satellites not orbiting simply above the equator were all given refined orbits easier in the future for anything else to avoid. If below 1 day orbit geostationary height, all were now being given orbit periods being some perfect simple fraction of a day. This let their positions be completely predictably forever known, whichever day, out of a repeated set of at most 10 days (such as for radii for 8-10 orbits/day). This was especially good for polar orbits to pass over our poles a few times night and day, to then fully observe and communicate with polar lands better viewed from North or South than if trying to view from over the equator.
Read more »
Read more »