Matsya Purana — Cosmic Architecture of Sun–Moon and the ‘Houses of the Gods’
ताराग्रहान्तराणि स्युर् उपर्युपर्यधिष्ठितम् ग्रहाश्च चन्द्रसूर्यौ च दिवि दिव्येन तेजसा //
tārāgrahāntarāṇi syur uparyuparyadhiṣṭhitam grahāśca candrasūryau ca divi divyena tejasā //
The intervals between the stars and the planets are arranged in successive layers, one above another; and the planets—together with the Moon and the Sun—abide in the heavens, shining with celestial radiance.
It does not describe Pralaya directly; it outlines the ordered, layered structure of the heavens, implying a regulated cosmic arrangement upheld by divine brilliance.
Indirectly, it supports the Purāṇic ideal that dharma aligns human order with cosmic order—kings and householders are urged to maintain harmony and regularity, mirroring the heavens’ structured arrangement.
No explicit Vāstu rule appears, but the concept of “layered, ordered placement” is often echoed in temple/altar symbolism where vertical tiers represent cosmic regions (stars, planets, sun and moon) in ritual cosmography.