It would be difficult to find someone who doesn’t know his or her Sun Sign (a.k.a. Star Sign). But there are very few non-astrologers who know that each of us also has his or her Moon Sign - the Sign of the Zodiac where the Moon was at the moment of his or her birth.
As there is no day without night, the astrological portrait of a person drawn just by the means of his or her Sun Sign will be incomplete and partial. This is especially true for women, since the Moon in astrology is the patroness of women, and in personality it rules the qualities which are especially important for women.
All right, you might say, but if our Moon Sign is so important, why do only a few of us know their Moon Sign? The problem is that you cannot determine your Moon Sign from just your birth day, as you do with your Sun Sign. The laws of the Moon’s motion are quite complicated, and to find out your Moon Sign special tables are needed.