The earliest Vedic text on astronomy is the Vedanga Jyotisha; Vedic thought later came to include astrology as well. Hindu natal astrology originated with Hellenistic astrology by the 3rd century BCE, though incorporating the Hindu lunar mansions. The names of the signs (e.g. Greek 'Kpios' for Aries, Hindi 'Kriya'), the planets (e.g. Greek 'Helios' for Sun, astrological Hindi 'Heli'), and astrological terms (e.g. Greek 'apoklima' and 'sunaphe' for declination and planetary conjunction, Hindi 'apoklima' and 'sunapha' respectively) in Varaha Mihira's texts are considered conclusive evidence of a Greek origin for Hindu astrology. The Indian techniques may also have been augmented with some of the Babylonian techniques.
Astrology sees mankind as being not only influenced by hereditary factors and the environment, but also by the state of our solar system at the moment of birth. The planets are regarded as basic life-forces, the tools we live by as well as the basis of our very substance. These planetary forces take on different forms, depending on their zodiacal position and on the way they relate to one another. The aspects formed between the planets describe these relationships, the positions of the planets in relation to the place of birth tell us of their expression in the spheres of life depicted by the astrological houses. By interpreting the roles of these players (the planets) and their qualities (the elements, signs and houses) and creating a synthesis, astrology is able to present a complete and comprehensive picture of the person and his potential, based on the natal horoscope.