Matsya Purana — Dhruva as Cosmic Pivot: Motions of Sun–Moon–Planets
भ्रमतस्तस्य रश्मी ते मण्डले तूत्तरायणे वर्धेते दक्षिणेष्वत्र भ्रमतो मण्डलानि तु //
bhramatastasya raśmī te maṇḍale tūttarāyaṇe vardhete dakṣiṇeṣvatra bhramato maṇḍalāni tu //
As the Sun moves in his circuit, those rays increase in the solar orb during the northward course (uttarāyaṇa); and here, during the southward course (dakṣiṇāyana), the maṇḍalas—as he revolves—are traversed differently.
It does not describe pralaya directly; it explains the Sun’s cyclical motion—how rays and orbital “circles” vary across uttarāyaṇa and dakṣiṇāyana—supporting the Purana’s broader model of cosmic order (ṛta) rather than dissolution.
By marking uttarāyaṇa/dakṣiṇāyana as meaningful cosmic phases, it underpins correct calendrical timing for rites, donations, and state/household observances—key dharmic duties in Purāṇic life regulated by seasonal and solar cycles.
Ritually, uttarāyaṇa and dakṣiṇāyana guide auspicious scheduling (saṃskāras, yajñas, dāna). Architecturally, such solar-course awareness informs orientation and timing in temple consecrations—useful for “Matsya Purana Vastu Shastra tips” tied to solar directionality.