Jyotish means the divine light of the God. The function of light is to make everything visible. Astrology endeavors to do the same in the life of an individual. This attempt has been made from ancient times and the science of astronomy which developed in India was also closely related with astrology.
The opinions of individual astrologer may vary depending upon the parameters employed. However, competent astrologers have always been respected despite wrong utilization by vested interests for quick material gains.
Astrology is one of the oldest sciences mankind has known. It is a Vedanga which means one of the branches, parts or components of the Vedas, which helps in understanding of the Veda mantras.
The vedanga are divided into six categories that is why astrology is described as one of the shadangas meaning one of the six parts. A student of astrology should know what these six parts are. They are Shiksha, Kalpa, Nirukta, Chhanda, Vyakarana and Jyotish. A study of all these was compulsory and essential before a disciple was initiated into the Vedas leading to gaining of knowledge both for worldly and material duties, and finally for the attainment of emancipation or moksha.
Jyotish is the study of the movement and position of constellations and planets called Ganita jyotisha (Mathematical astrology), and their effects on animate as well as inanimate as well as inanimate beings, called Phalita jyotish (Predictive astrology).