Matsya Purana — The Attendant Hosts of the Sun and Moon: Monthly Gaṇas
संभृतं त्वर्धमासेन अमृतं सूर्यतेजसा भक्षार्थमागतं सोमं पौर्णमास्यामुपासते //
saṃbhṛtaṃ tvardhamāsena amṛtaṃ sūryatejasā bhakṣārthamāgataṃ somaṃ paurṇamāsyāmupāsate //
Gathered and matured over a half-month, and made nectar-like by the Sun’s radiance, Soma—having come forth for sacred consumption—is worshipped on the night of the Full Moon (Paurṇamāsī).
It does not describe Pralaya directly; instead, it presents a cosmological-ritual principle: Soma (the lunar nectar) is ‘ripened’ through the fortnight and enhanced by solar energy, showing the Purana’s view of cosmic cycles supporting sacred rites.
It supports the householder’s (and by extension the king’s) duty to keep time-reckoning and ritual observances: honoring Paurṇamāsī aligns domestic and public religion with the lunar fortnight, sustaining dharma through calendrical worship.
The significance is ritual rather than architectural: it prescribes Full-Moon worship of Soma, emphasizing the fortnightly maturation of sacred potency and the appropriate timing (Paurṇamāsī) for offerings and devotional observance.