Matsya Purana — Dhruva as Cosmic Pivot: Motions of Sun–Moon–Planets
तथा संयोगभागेन सिद्धो वै भास्करो रथः तेनासौ तरणिर्देवो नभसः सर्पते दिवम् //
tathā saṃyogabhāgena siddho vai bhāskaro rathaḥ tenāsau taraṇirdevo nabhasaḥ sarpate divam //
Thus, by the proper measure of conjunction (and arrangement), the radiant Sun’s chariot is duly accomplished; and by that, the god Taraṇi (the Sun) glides through the sky and traverses the heavens.
It does not directly describe Pralaya; it emphasizes cosmic order—how Surya’s motion is established by a correct ‘conjunction/arrangement,’ reflecting the regulated functioning of the universe.
Indirectly, it presents Surya as a model of orderly, uninterrupted duty (niyati): just as the Sun follows an established course, kings and householders are urged in the Matsya Purana to uphold regular discipline, time-keeping, and righteous routine aligned with dharma.
No explicit Vastu rule appears, but the stress on correct ‘saṃyoga’ (proper joining/arrangement) supports a core Vastu idea: precise proportion and correct assembly are what make a structure or ritual system ‘siddha’ (successfully established).