Matsya Purana — Dhruva as Cosmic Pivot: Motions of Sun–Moon–Planets
मण्डलानि भ्रमन्ते ऽस्य खेचरस्य रथस्य तु कुलालचक्रभ्रमवन् मण्डलं सर्वतोदिशम् //
maṇḍalāni bhramante 'sya khecarasya rathasya tu kulālacakrabhramavan maṇḍalaṃ sarvatodiśam //
The maṇḍalas (spheres or orbits) of this sky-moving chariot revolve; its circle turns in every direction, like the spinning wheel of a potter.
It does not directly discuss Pralaya; it focuses on cosmography—how celestial circles/orbits are imagined to rotate in the sky.
Indirectly, it supports the Purāṇic ideal that rulers and householders should align rituals and calendars with cosmic order (ṛta), since time and auspiciousness are tied to perceived celestial motions.
No Vāstu rule is stated, but the image of a perfectly rotating ‘wheel’ (cakra) is often used in ritual/cosmological thinking to emphasize symmetry and directional completeness—useful for understanding why mandalas and directional layouts matter in later Vāstu and temple-planning contexts.