Matsya Purana — Solar–Lunar Motions
अभ्यन्तरं स पर्येति मण्डलान्युत्तरायणे बाह्यतो दक्षिणेनैव सततं सूर्यमण्डलम् //
abhyantaraṃ sa paryeti maṇḍalānyuttarāyaṇe bāhyato dakṣiṇenaiva satataṃ sūryamaṇḍalam //
During uttarāyaṇa, the Sun traverses the inner set of orbital circles; but during dakṣiṇāyana, it continually moves along the outer path around the solar sphere.
It does not describe pralaya directly; it focuses on cosmic order—how the Sun’s motion is regulated through inner and outer mandalas—supporting the Purana’s broader view of a structured, law-governed universe.
By clarifying uttarāyaṇa/dakṣiṇāyana, it underpins correct calendrical timing for rites, festivals, and governance—kings and householders rely on such solar cycles to schedule dharmic observances and state rituals.
Ritually, uttarāyaṇa and dakṣiṇāyana are key markers for choosing auspicious periods; such solar-cycle awareness also informs temple calendars and consecration scheduling (pratiṣṭhā, utsava timing) in Puranic practice.