> Slightly non-spherical gravitational fields don't matter too much unless you're doing a lot of orbits. Actually the effects of non spherical gravity is one o

> Slightly non-spherical gravitational fields don't matter too much unless you're doing a lot of orbits. Actually the effects of non spherical gravity is one or two orders of magnitude greater than the influence of all the other bodies in the solar system combined for low earth orbit satellite operations. It has a huge effect, causing a rotation of the orbital plane several degrees per day (up to 10 or so). The effect isn't as great for lunar or interplanetary trajectories, though.