Problem is the moon’s orbit ins’t correctly scaled in the game, so the SFS moon’s orbital period isn’t the same as the real moon.
And the geostationary orbit isn’t 1789 km either. 1789 is only what you obtain when you scale down the real geostationary orbit to SFS scale, but that doesn’t give you an orbital period of 23h, 56m.
Altaïr and I calculated the real height for an orbital period of 23h 56mins around SFS Earth a looooooong time ago. Do you remember, Altaïr?
I’ll try to find the actual value and post it here.
Edit: Actually, is right here. Just a few posts up.
Geostationary Orbit