Gemini and Aquarius are both air signs, so they are both intelligent and ruled by their heads, not their hearts. This should make them compatible, as they both like to go out and have alot of interests. The Capricorn Moon with the Gemini sun person is more serious than they appear, and has a great need for security. It's not so much about material things, but a feeling of safety in life. The Leo moon likes nice possessions and a nice home in which to entertain. But this should dovetail with Capricorn's need for the security home brings. Leo moon is dramatic, which Capricorn moon won't like, especially in public. But Leo moon can pull Capricorn moon out of those funks they get into, or just jolly them out of being too serious. It's a workable situation based on this info. Aquarius is compatible with other air signs and fire signs. If you read my hub on Planetary Vibrations it has more info. Good luck!