Re: If the Moon were replaced by other planets...
Jupiter's radius Rj is about 10.9 times the Earth's radius Re, which is about 3.7 time's the Moon's radius Rm, so the angle subtended at the same distance would be about 40 times greater for Jupiter than the Moon and the solid angle (apparent area subtended) would be about 1600 times greater.
"After a time, you may find that having is not so pleasing a thing, after all, as wanting. It is not logical, but it is often true." -- Spock -- Flip flap!