Matsya Purana — Solar–Lunar Motions
अर्धरात्रं संयमने वारुण्यामस्तमेति च स शीघ्रमेव पर्येति भानुरालातचक्रवत् //
ardharātraṃ saṃyamane vāruṇyāmastameti ca sa śīghrameva paryeti bhānurālātacakravat //
At midnight, at Saṃyamana, the Sun is said to set in the realm of Varuṇa; and he swiftly completes his circuit—like a firebrand whirled so as to appear a circle.
It does not describe Pralaya directly; it presents a cosmological model of the Sun’s rapid circuit, supporting Purāṇic time-reckoning that remains relevant across cycles of creation and dissolution.
By grounding daily and nightly divisions (like midnight) in cosmic order, it underwrites proper timing for royal administration, vows, and household rites—since dharma is performed according to correct kāla (time).
Indirectly, it supports ritual timing (muhūrta, midnight observances) and directional awareness (Varuṇa’s quarter), both of which are used in temple/ritual planning and in aligning activities with the cosmic order.