The following is an excerpt from an introduction to Jyotish.
History of Jyotish Sidereal Zodiac/Chart Formats/Indian Mythology
I welcome you to Vedic or Hindu Astrology. You will find many similarities to the astrology you know and even more to Hellenistic Astrology if you encounter that fascinating area of study. Jyotisha is a Sanskrit word. Although there is some controversy about the literal meaning, it is often translated as: Jyoti= light and Isha= soul or spirit; isha is also sometimes translated as god or lord.