Narapatijayacarya 3.1.6

They arise in sequence, each for one ghaṭikā:
earth, water, likewise fire, wind, and ether.

Earth flows in the middle, water downward, and fire upward;
wind flows obliquely, and ether flows at the transition.

Each single element beginning with earth arises for one ghaṭikā.
Within a day and night there are thus twelve transitions.

At the beginning [of the day] is the Moon in the bright fortnight, but the Sun in the other [fortnight].
Starting from the first lunar day, [each runs for] three [days]; the rise is sequential in triads.