As the sun travels around the earth once each year, it moves through all twelve signs of the zodiac, spending approximately one month in each sign. The sign that the Sun was transiting at the time of your birth is your Sun Sign. Astrology based upon your sun sign is a generalized outline of your individual astrological characteristics. The Sun is the most important influence in your horoscope, and in many ways determines how others view you. However, it does not take into consideration the astrological influence of the other planets and only by studying the entire birth chart can an astrologer begin to get a complete picture of your personality.