Matsya Purana — Solar–Lunar Motions
दक्षिणप्रक्रमे वापि दिवा शीघ्रं विधीयते गतिः सूर्यस्य वै नक्तं मन्दा चापि विधीयते //
dakṣiṇaprakrame vāpi divā śīghraṃ vidhīyate gatiḥ sūryasya vai naktaṃ mandā cāpi vidhīyate //
Even in the Sun’s southern course (dakṣiṇāyana), his motion is said to be swift by day; but at night, indeed, it is also described as slow.
This verse does not address pralaya directly; it focuses on purāṇic-astronomical description of the Sun’s apparent गति (gati) in the southern course, supporting calendrical and cosmological teaching rather than dissolution narratives.
By distinguishing day/night and seasonal motion (dakṣiṇāyana), it underpins proper timing for duties—governance, sacrifices, vows, travel, and household rites—since purāṇic dharma practice often depends on correct reckoning of time (kāla) and auspicious periods.
Indirectly, it supports muhūrta and calendrical selection: temple rites, consecrations, and Vastu-related undertakings commonly depend on solar course and day/night considerations, for choosing appropriate timings in accordance with traditional Jyotiṣa frameworks.