Matsya Purana — Solar–Lunar Motions
पतत्येकं तु मध्याह्ने भाभिरेव च रश्मिभिः उदितो वर्धमानाभिर् मध्याह्ने तपते रविः //
patatyekaṃ tu madhyāhne bhābhireva ca raśmibhiḥ udito vardhamānābhir madhyāhne tapate raviḥ //
At midday the Sun appears to stand in a single fixed place, shining by his own rays; having risen, with rays that steadily grow in power, he blazes at noon.
This verse is not directly about Pralaya; it describes the Sun’s midday condition—its rays intensifying and producing peak heat—supporting the Purana’s broader cosmological/time framework rather than dissolution.
By marking midday as the peak of solar heat, it implicitly aligns with dharmic daily discipline: midday is a key time-point for regulated activity (work, rest, and traditionally the main meal/ritual timing), encouraging orderly living guided by cosmic rhythms.
Midday solar intensity is relevant for ritual scheduling (madhyāhna-kāla) and, indirectly, for Vāstu considerations like sunlight/heat management and orientation—recognizing when the Sun’s heat is strongest.