Saravali 8.51

8.51

prasava ke lagnādi kā dicāra
kamunibhāge divasaniśorjanmani lagnaṃ vadedyuktyā |
udayagaṇāt prasavaḥ syāddinapakṣamuhūrtamāsasaṃjñarkṣāt ||

Consideration of the lagna and other factors at delivery:
One should logically declare the lagna at birth from the portion of the day or night elapsed;
delivery happens from the count of the rising sign through the signs designated by day, fortnight, muhūrta, and month.