Author(s): Balamurugan S, Thanganila G and Madhavan R

Abstract: The Siddhars by their spiritual and yogic practices attained extremely great knowledge and experience in Vaithiyam (Medicine), Jothidam (Astrology), Manthirigam (Thanthric Practices), Yogam (Meditation and yogic exercises) and Gnanam (Knowledge about the Almighty). Siddhars believed in a holistic concept. There are 18 siddhars who are considered as the pillars of siddha system of medicine according to Tamil tradition. Astrology is the study of how the positions of the stars and movements of the planets have a supposed influence on events and on the lives and behavior of people. An astrologer looks at the planetary positions and tries to understand a person's character or tries to predict the future and their diseases with the help of Rasi or zodiac signs, Nakshathram or lunar mansion is one of the 27 divisions of the sky, nine grahas (Navagrahas) or Nine Planets of astrology. It’s possible in astrology to diagnose a disease well before its actual appearance in human body. The Aim of the study is to describe about astrological importance in human life and prediction of diseases with the help of the siddhars astrological theory.