सूर्यरथ-कालचक्र-आयनविभागः, संध्योपासनम्, देवयान-पितृयानम्, विष्णुपद-गङ्गावतरणम्
राशिप्रमाणजनिता दीर्घह्रस्वात्मता दिने तथा निशायां राशीनां प्रमाणैर् लघुदीर्घता
rāśipramāṇajanitā dīrghahrasvātmatā dine tathā niśāyāṃ rāśīnāṃ pramāṇair laghudīrghatā
Из мер знаков зодиака возникает длина и краткость дня; и теми же мерами знаков ночь также становится короче или длиннее.
Sage Parāśara (teaching Maitreya)
This verse uses rāśi-measure as the explanatory basis for why days and nights vary in length, presenting celestial order as measurable and law-governed.
He attributes it to the pramāṇa—measured extents—of the rāśis, by which day becomes long or short and the night correspondingly varies.
Even when not named in the verse, the Purāṇic framework treats such precise cosmic regularity as an expression of Vishnu’s governance of kāla (time) and universal order.