Matsya Purana — Solar–Lunar Motions
ततो मन्दतरं ताभ्यां चक्रं तु भ्रमते पुनः मृत्पिण्ड इव मध्यस्थो भ्रमते ऽसौ ध्रुवस्तथा //
tato mandataraṃ tābhyāṃ cakraṃ tu bhramate punaḥ mṛtpiṇḍa iva madhyastho bhramate 'sau dhruvastathā //
Then, slower than those two, the celestial wheel revolves again; and Dhruva, stationed at the center, also turns—like a lump of clay fixed in the middle of a spinning wheel.
This verse is not about Pralaya directly; it explains cosmic order—how the celestial wheel moves while Dhruva remains centrally placed, a stability motif often contrasted with dissolution elsewhere in the Purana.
By presenting Dhruva as the stable center amid motion, the verse implicitly models dharma: a king or householder should remain steady in principle while managing changing circumstances.
No explicit Vāstu rule is stated, but the center (madhya) as a stabilizing pivot echoes Vāstu ideas of the Brahmasthāna—keeping the central space conceptually ‘steady’ while activities circulate around it.