[CapturingTheNight (Greg)]

Hi all,

A friend and I were talking about my "Fly Me To The Moons" image and he jokingly said that he didn't like it as the rings of Saturn were not framing Jupiter. Ie. Saturn perfectly behind Jupiter. Now I realise that due to the apparent size of these objects (as viewed from Earth) a shot like this is basically impossible, but it did get me thinking......

Is there a way or a program that you can use to work out when say Mars would be directly in front of Jupiter or Saturn as viewed from somewhere on Earth? I'm sure the celestial mechanics must line up at some point and I am also sure that it probably wont happen in my lifetime and probably happens once every million years or so. But, out of curiosity, when would this happen?

Cheers

Greg