You likely already know what your zodiac sign is, but do you know what determines what it will be? Of course, it depends on your birthdate, but furthermore, it relates to the position of the sun at the time of your birth. There are twelve possible zodiac signs, and each one takes up an equal portion of the zodiac wheel. Astrologists believe that this sign will tell you invaluable information about your future and your personality. The signs are thought the be an energy that acts on other bodies, including transiting planets.