Amāvasyā-Pitṛtarpaṇa: Purūravas and the Soma-Based Ancestral Offering (अमावस्या-पितृतर्पण / सोमतर्पण-विधि)
स तदा ह्याहुतेः कालोदर्शस्य तु वषट्क्रिया / कुहेति कोकिलेनोक्तो यः स कालः समाप्यते
sa tadā hyāhuteḥ kālodarśasya tu vaṣaṭkriyā / kuheti kokilenokto yaḥ sa kālaḥ samāpyate
Then, at the time of the oblation (āhuti), in the Darśa rite the sacred ‘vaṣaṭ’ act is performed; the time marked by the kokila’s call “kuhe” is the time that comes to its close.