Matsya Purana — Solar–Lunar Motions
चरन्नसावुदीच्यां च ह्य् अशीत्या मण्डलाञ्छतम् अभ्यन्तरं स पर्येति क्रमते मण्डलानि तु //
carannasāvudīcyāṃ ca hy aśītyā maṇḍalāñchatam abhyantaraṃ sa paryeti kramate maṇḍalāni tu //
And as it moves northward, it traverses within a hundred maṇḍalas by eighty stages; thus it proceeds, passing through the maṇḍalas in due order.
This verse is not about Pralaya directly; it describes the ordered motion of the Sun through cosmic “maṇḍalas,” supporting the Purāṇic framework by which time and cycles are understood.
Indirectly, it underpins dharma through calendrical order: the Sun’s regulated course is the basis for seasons, rituals, and proper timing (kāla) for royal duties, agriculture, and household rites.
Ritually, it supports timing for solar-based observances (e.g., seasonal rites). Architecturally, it can inform temple orientation and solar considerations, though no explicit Vāstu rule is stated in this verse.