Matsya Purana — Solar–Lunar Motions
*सूत उवाच अत ऊर्ध्वं प्रवक्ष्यामि सूर्यचन्द्रमसोर्गतिम् सूर्याचन्द्रमसावेतौ भ्राजन्तौ यावदेव तु //
*sūta uvāca ata ūrdhvaṃ pravakṣyāmi sūryacandramasorgatim sūryācandramasāvetau bhrājantau yāvadeva tu //
Sūta said: “Now, henceforth, I shall explain the course of the Sun and the Moon—how these two, the Sun and the Moon, shine forth for as long as they endure.”
It does not describe Pralaya directly; it introduces a cosmological exposition on the continuing motion and radiance of the Sun and Moon within the ordered universe.
Indirectly, it supports dharma by grounding timekeeping (days, months, seasons) in the Sun–Moon order—useful for a king’s calendar, administration, and for householders’ observances tied to lunar and solar cycles.
No Vāstu rule is stated here, but the Sun–Moon framework underlies ritual timing (tithi, pakṣa, māsa) that governs temple rites and consecrations—often marketed as “Matsya Purana ritual timing and cosmology background.”