Like the seasons and the tides, your emotions ebb and flow in cycles. Just as the Moon pulls the tides, it also pulls at your subconscious mind, rhythmically, subtly, mysteriously, but as predictably as the tide rolls in and back out again.
The Moon governs all kinds of cycles; you've probably heard that women's menstrual cycles are connected to its monthly phases. Your feelings and your subconscious mind also lie within this planet's domain.
Your emotional nature is influenced by where the Moon lies in your birth chart -- not only what sign of the Zodiac it's in, but how it aspects the other planets in your chart. It can tell you a lot about your emotional nature -- whether you process your feelings easily or bottle them up; whether you tend toward contentment, anger, sensitivity or what have you. Your attitudes toward love and intimacy are greatly influenced by the Moon's placement in your chart.
A soft, sensitive and receptive planet, the Moon has to do with how you nurture and need to be nurtured; therefore, it is also related to things like food, family, protection and caretaking. On a daily basis, whether you're feeling upset, nervous, calm, contented or just blah, you can look to where the Moon is in the sky at that particular moment and learn a lot about your emotional state.
The Moon rules the emotional sign of Cancer; read about Cancer to learn more about this sign and the Moon's influence on it.