Not a bug, but an oddity
from
GalCiv2 Forums
You got the orbit of the moon right, but it orbits the earth so fast that an observer on earth will see it rise in the WEST and set in the EAST. It just looks weird to see the moon orbiting faster than the rotation of the earth... Not to mention that all life on earth would probably be wiped out by the enormous tidal stresses the moon would put on the earth... if the moon could somehow stay in orbit without shattering into a zillion pieces or go flying off into space. 
Bill

Bill