Amāvasyā-Pitṛtarpaṇa: Purūravas and the Soma-Based Ancestral Offering (अमावस्या-पितृतर्पण / सोमतर्पण-विधि)
तत्कालसंमिता यस्मादमावास्या कुहूः स्मृता / सिनीवालीप्रमाणस्तु क्षीणशेषो निशाकरः
tatkālasaṃmitā yasmādamāvāsyā kuhūḥ smṛtā / sinīvālīpramāṇastu kṣīṇaśeṣo niśākaraḥ
Because it accords with that very measure of time, the new-moon night (amāvāsyā) is remembered as ‘Kuhū’; then the Moon, lord of the night, is left as a waning remnant, in the measure of Sinīvālī.