Astrology Zodiac Sign

Zodiac is an imaginary belt stretching about 9o north and 9o south of the ecliptic within which the planets and the Moon remain in course of their movement. In case of the Moon, the deviation from the ecliptic is about +5o. The belt is divided into 12 equal sectors each of 30o and each sector called a 'sign' or Rasi. According to the western system of reckoning (i.e. Sayana system) the first rasi i.e. Aries starts from the point of intersection of the ecliptic and the equator. there are 12 signs or rasis in both the systems, the first being Mesha according to Indian system.