Indology, Ancient Indian History, Indian Astronomy, Metrology, Hinduism.
Śrīmadbhāgvatam, a 24-hour period of one sunrise to next sunrise was divided into day of 4 prahara (24 nāḍikā, 6 nāḍikā per Prahara), dusk of 2 muhūrta (4 nāḍikā, 2 nāḍikā per muhūrta), night of 4 prahara (28 nāḍikā, 7 nāḍikā per Prahara), and dawn of 2 muhūrta (4 nāḍikā, 2 nāḍikā per muhūrta).