Matsya Purana — Dhruva as Cosmic Pivot: Motions of Sun–Moon–Planets
वृष्टिसर्गस्तथा तेषां धारासारः प्रकीर्तितः पुष्करावर्तका नाम ये मेघाः पक्षसम्भवाः //
vṛṣṭisargastathā teṣāṃ dhārāsāraḥ prakīrtitaḥ puṣkarāvartakā nāma ye meghāḥ pakṣasambhavāḥ //
Likewise, their particular mode of sending forth rain—its continuous downpour and essence—has been described. Those clouds, born of the rainy season, are known as the Puṣkarāvartaka clouds.
It does not describe Pralaya directly; it focuses on cosmic order in nature—how rain is generated and classified—supporting the Purana’s broader view of regulated creation (sarga) rather than dissolution.
By emphasizing orderly rainfall as a foundation of prosperity, it indirectly supports the king’s duty to protect agriculture and water resources and the householder’s reliance on seasonal rhythms for cultivation, offerings, and sustenance.
No direct Vāstu rule is stated, but the verse is relevant to ritual timing: sustained rains and seasonal cloud-types inform calendrical planning for rites, maintenance of water systems, and temple/agricultural scheduling.