Astrology based on lunar mansions or constellations, called nakshatras, were present in the early Vedic period in India. Mesopotamian ideas of omens reached India with the Achaemenian dynastyas early as the 5th century bce. Greek astrology then spread to India in the 2nd and 3rd centuries ce. Sanskrit translations of Greek texts adapted astrology to fit Indian societal and cultural contexts. The signs of the zodiac were translated into Sanskrit and the planets, or navagrahas were integrated along with the nakshatras into a complex system of Hindu astrology.