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Astrologically, Moon represents ones feminine side, our inner nature and feeling, instinctive side. Sun is the external, masculine portion of us. The Sun is our will, our vitality and creative force.
Astronomically, what happens on the Sun and the Moon can change what we see and feel here on Earth. Solar flares can mess up TV and radio, and the Moon's gravity affects the tides. Without the Sun, the Earth would be a big ball of frozen mud, just another asteroid, drifting in space with no gravity to anchor it here and nothing to give us heat and light. We could not be here without the Sun. The Moon could not be here without the Earth. Most scientists now believe that the Moon was ripped from the Earth by a massive impact billions of years ago. Our Moon is very much like our Earth-- except that it has no atmosphere.