Retrograde orbits are uncommon as far as I know, but polar orbits are common for earth observation. A satellite going south could meet one going north. Also un

Retrograde orbits are uncommon as far as I know, but polar orbits are common for earth observation. A satellite going south could meet one going north. Also unless you launch from the equator inclined orbits are cheaper to reach than equatorial. The ISS for example goes just far enough north to pass the Baikonur Cosmodrome.