If Mercury (budha) should pass through the constellations of Svāti , Bharaṇi, Roniṇi and Kṛttikā, sacred respectively to Vāyu , to Yama, to Pitāmaha and to Agni, his course is technically known as Prākṛta. If he should pass through the constellations of Mṛgaśīrṣa, Ārdrā, Maghā, Aśleṣā, sacred respectively to the Moon, to Siva , to the Pitṛs and to the serpent, his course is known as Miśragati.