Matsya Purana — Soma
उद्दिश्य ताममावास्यां यदा दर्शं समागतौ अन्योन्यं चन्द्रसूर्यौ तु दर्शनाद्दर्श उच्यते //
uddiśya tāmamāvāsyāṃ yadā darśaṃ samāgatau anyonyaṃ candrasūryau tu darśanāddarśa ucyate //
When, on that Amāvāsyā night, the Moon and the Sun come together in conjunction, as though facing one another, it is called “darśa,” because it is the ‘meeting/appearance’ (darśana) of the two luminaries.
This verse does not discuss pralaya; it defines calendrical time (darśa/amāvasyā) by describing the Sun–Moon conjunction used for ritual reckoning.
By defining darśa (new-moon conjunction), it supports correct timing for śrāddha, vrata, and darśa-related rites—key household and royal duties in maintaining dharma through properly timed rituals.
Ritually, darśa/amāvasyā is an auspicious/required marker for certain monthly rites; such time-definitions also guide selecting muhūrtas for consecrations and temple-related ceremonies in Purāṇic practice.