Jyotisha (or Jyotishyam from Sanskrit jyotiṣa, from jyótis- "light, heavenly body") is the traditional Hindu system of astrology, also known as Hindu astrology, Indian astrology, and more recently Vedic astrology. The term Hindu astrology has been in use as the English equivalent of Jyotiṣa since the early 19th century, whereas Vedic astrology is a relatively recent term, entering common usage in the 1980s with self-help publications on Āyurveda or Yoga. Vedanga Jyotisha is one of the earliest texts about astronomy within the Vedas. However, some authors have claimed that the horoscopic astrology in the Indian subcontinent came from Hellenistic influences, post-dating the Vedic period.
The foundation of Hindu astrology is the notion of bandhu of the Vedas, (scriptures), which is the connection between the microcosm and the macrocosm. Practice relies primarily on the sidereal zodiac, which is different from the tropical zodiac used in Western (Hellenistic) astrology in that an ayanāṁśa adjustment is made for the gradual precession of the vernal equinox. Hindu astrology includes several nuanced sub-systems of interpretation and prediction with elements not found in Hellenistic astrology, such as its system of lunar mansions (Nakṣatra).
A Nakṣatra or lunar mansion is one of the 27 divisions of the sky, identified by the prominent star(s) in them, used in Hindu astrology. Historical (medieval) Hindu astrology enumerated either 27 or 28 nakṣatras. Today, a rigid system of 27 nakṣatras covering 13°20’ of the ecliptic each is generally used. The missing 28th nakshatra is Abhijeeta. Each nakṣatra is divided into quarters or padas of 3°20. Of the greatest importance is the Abhiśeka Nakṣatra which is the King amongst all the Nakṣatras and worshipping and propitiating this Nakṣatra has the power to remedy all the other Nakṣatras. Remedial measures are in general the high-water mark of all realistic predictive astrology work and go a long way in mitigating Karma.