Matsya Purana — Soma
कुहेति कोकिलेनोक्तं यस्मात्कालात्समाप्यते तत्कालसंज्ञिता ह्येषा अमावास्या कुहूः स्मृता //
kuheti kokilenoktaṃ yasmātkālātsamāpyate tatkālasaṃjñitā hyeṣā amāvāsyā kuhūḥ smṛtā //
It is called “Kuhū,” as spoken by the cuckoo (kokila), because at that time the lunar period comes to completion; therefore this new-moon day (amāvāsyā) is indeed designated by that time-name and is remembered as Kuhū.
It does not discuss pralaya directly; it defines the new-moon tithi “Kuhū” as the time when a lunar period is said to ‘complete,’ reflecting Purāṇic cosmological time-reckoning rather than dissolution.
By clarifying the identity of Amāvāsyā (Kuhū), it supports correct observance of vrata, śrāddha, and monthly ritual timing—core household and royal calendrical duties in Purāṇic dharma.
Ritually, it anchors Amāvāsyā under the name “Kuhū,” useful for scheduling new-moon rites (e.g., śrāddha, tarpaṇa, vrata). No Vāstu or temple-architecture rule is stated in this verse.