Matsya Purana — Cosmic Architecture of Sun–Moon and the ‘Houses of the Gods’
उदयास्तमये ह्यत्र अहोरात्रं विशत्य् अपः यश्चासौ तपते सूर्यः सो ऽपः पिबति रश्मिभिः //
udayāstamaye hyatra ahorātraṃ viśaty apaḥ yaścāsau tapate sūryaḥ so 'paḥ pibati raśmibhiḥ //
Here, at sunrise and at sunset, day and night enter into the waters; and that very Sun who blazes with heat drinks up the waters by means of his rays.
It frames water as a cosmic principle regulated by the Sun’s rays—an idea used in Purāṇic cosmology to explain how waters are gathered and released in cycles that can culminate, on a vast scale, in pralaya-like inundation.
By emphasizing predictable natural cycles (sunrise–sunset, absorption of waters), it supports dhārmic governance and household discipline: plan agriculture, rituals, and resource use in harmony with seasonal and daily rhythms rather than against them.
Ritually, it highlights sunrise and sunset as key sandhyā times and supports water-related rites (snāna, ācamana). Architecturally, it indirectly reinforces orientation and solar considerations—placing sacred spaces and daily worship with awareness of the Sun’s path.