Though the Shatapatha Brahmana uses the Brhad-Aranyaka names, most later texts follow the Mahabharata names with the exception that Āpa 'water' usually appears in place of Aha. The Vishnu Purana equates Prabhāsa with the lights of the 27 Nakshetra (Constellations/Lunar Mansions) and Dhruva with Akash Tatwa, that is space, Dhruva seemingly taking over Aha's role when Aha is replaced by Āpa.