The 12 signs of the zodiac are based on a combination of astrological, astronomical and mythological influences. Astrologers believe that each sign is associated with certain characteristics and traits, which can be used to predict future events. Astronomically, the signs correspond to constellations in the night sky that divide up the ecliptic into 12 equal parts. Finally, many of these constellations have been associated with gods or goddesses from various ancient cultures for centuries. All together, this combination has resulted in our modern system of 12 zodiac signs representing different aspects of life and personality.