Bhrigusmriti 1.9: Smṛtitattva · Kālanirṇaya · Smṛtikaustubha +1

1.9

grastāv evāstamanaṃ tu ravīndū prāpnuto yadi | tayoḥ paredyur udaye jñātvābhyavaharen naraḥ

If the sun and the moon reach sunset while still eclipsed, / a man may eat on the following day after ascertaining their rising.

If the sun or moon sets while eclipsed, a man should eat only after seeing their rising on the next day.