Zodiac Signs are–by astrological and astronomical means–a differentiation of the dates of a year, split up into 12 Zodiacs. Each of them is ruled by a celestial body and refers to one of the four elements: fire, water, air and earth. Since each of the Sailor Senshi has a birthday in her civillian identity, she also matches a zodiac that may have a significant effect on her appearance, personality and attacks.