Astrology was progressed in ancient time on the basis of arithmatic. Aiyabhatta was an astrologer as well as mathematician. He propounded the principle, “The earth rotates on its axis around the sun from west to east, by finding planets and satellite. He explained the phenomenon of solar and lunar eclipse. By observing the rotation of moon around the earth and the rotation of the earth, Indian astrologers explained about the twelve zodiac sign stars, 27 nakshatras, 30 days of a month phase, a year of 12 months and to add one more month in every third year to maintain the difference between solar and lunar year. Besides Aryabhatta, Varahmihir, Kanad, Nagarjuna, Banabhatta were some other main Indian astrologers and astronomers.
