सूर्यरथ-कालचक्र-आयनविभागः, संध्योपासनम्, देवयान-पितृयानम्, विष्णुपद-गङ्गावतरणम्
दिनादेर् दीर्घह्रस्वत्वं तद्भोगेनैव जायते उत्तरे प्रक्रमे शीघ्रा निशि मन्दा गतिर् दिवा
dināder dīrghahrasvatvaṃ tadbhogenaiva jāyate uttare prakrame śīghrā niśi mandā gatir divā
The lengthening and shortening of days and nights arises solely from the Sun’s own course. In his northward progress, he moves swiftly by night and slowly by day.
Sage Parāśara (teaching Maitreya)
Cosmic Hierarchy: Lokas
Concept: The waxing and waning of day and night arise from the Sun’s regulated motion as it turns northward, revealing an intelligible cosmic order.
Vedantic Theme: Dharma
Application: Observe daily and seasonal cycles as prompts for discipline (niyama) and timely practice such as sandhyā-vandana.
Vishishtadvaita: Cosmic regularity is read as the Lord’s niyantṛtva (governance) operating through natural agencies like Sūrya.
This verse links uttarāyaṇa to the changing lengths of day and night, presenting celestial motion as the mechanism through which time is regulated in the cosmos.
He attributes it to the Sun’s own traversal of its path—its “course” is the direct cause of day and night becoming longer or shorter.
Even when describing astronomy, the Purana frames cosmic regularity as part of the divinely upheld order—time and its measures operate within the sovereignty of the Supreme Reality, Vishnu.