Matsya Purana — Narasimha’s Victory over Hiraṇyakaśipu and the Catalogue of Apocalyptic Omens
गृहीतो राहुणा चन्द्र उल्काभिरभिहन्यते उल्काः प्रज्वलिताश्चन्द्रे विचरन्ति यथासुखम् //
gṛhīto rāhuṇā candra ulkābhirabhihanyate ulkāḥ prajvalitāścandre vicaranti yathāsukham //
When the Moon is seized by Rāhu, it is struck by blazing meteors; those fiery meteors then move about upon the Moon, roaming there as they please.
It does not describe Pralaya directly; it presents an ominous celestial phenomenon—Rāhu’s seizure of the Moon with fiery meteors—as a sign-category used in Purāṇic omenology.
Such sky-portents are traditionally read as warnings for rulers: a king should respond with restraint, protective governance, and prescribed appeasement rites (śānti) rather than panic, treating eclipses/omens as prompts for ethical vigilance and public welfare.
Architectural rules are not discussed here; the ritual takeaway is the implication of eclipse/omen “śānti” practices—propitiatory rites, charity, and mantra-based pacification commonly recommended when Rāhu-related lunar signs appear.