Zodiac Wheel.

The Zodiac is an imaginary belt of the Heavens, within which are the apparent paths of the Sun, Moon and Planets. The belt contains twelve Constellations of Stars (hence the twelve Signs of the Zodiac) and each of the twelve Signs are governed by one of these four Elements: Earth, Fire, Air or Water. Astrology plays a big part in the Zodiac, as it is the actual study of influence that the Sun, Moon, Stars and Planets have on an individual at the time of their Birth (which creates all the Sun/Moon/Rising Signs of the Zodiac).