Meaning of the Symbol of The Moon
If the astrological sun symbol represents our actions, we can say that the moon represents our instinctive reaction, an immediate and unthinkable reaction to everything that comes our way. What the sun shines, the moon reflects. Therefore, the moon can also be seen as a mirror of the more passive and reflexive parts of our personality.
Where the sun gives you personality and heart, the moon gives you soul. It's not rational, but it's irrational and unexplainable. It can symbolize our gut reaction to what is happening to us. It may be censored by the stronger energy of the sun. The moon tells us what we are feeling and the sun tells us how to deal with those feelings.