Prajāpati-vaṃśānukīrtana — Genealogical Enumeration of Progenitors
Dharma’s Line and the Sādhyas
अहोरात्रविभागश्च नक्षत्राणि समाश्रितः / मुहुर्त्ताः सर्वनक्षत्रा अहोरात्रभिदस्तथा
ahorātravibhāgaśca nakṣatrāṇi samāśritaḥ / muhurttāḥ sarvanakṣatrā ahorātrabhidastathā
The division of day and night rests upon the Nakṣatras; and in every Nakṣatra the Muhūrtas likewise mark the distinctions of day and night.