Jyotisha or Jyotishya (from Sanskrit jyotiṣa, from jyóti- "light, heavenly body") is the traditional Hindu system of astrology, also known as Hindu 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 1970s with self-help publications on Āyurveda or yoga. Vedanga Jyotishya is one of the earliest texts about astronomy within the Vedas. However, some authors have claimed that the horoscopic astrology practiced in the Indian subcontinent came from Hellenistic influences, post-dating the Vedic period. Some authors argue that in the mythologies Ramayana and Mahabharata, only electional astrology, omens, dreams and physiognomy are used but there have been several articles and blogs published which cites multiple references in those books about rashi (zodiac sign) based astrology.