Matsya Purana — Cosmic Architecture of Sun–Moon and the ‘Houses of the Gods’
तस्मान्नक्तं पुनः शुक्ला ह्य् आपो दृश्यन्ति भासुराः एतेन क्रमयोगेण भूम्यर्धे दक्षिणोत्तरे //
tasmānnaktaṃ punaḥ śuklā hy āpo dṛśyanti bhāsurāḥ etena kramayogeṇa bhūmyardhe dakṣiṇottare //
Therefore, again at night the waters appear bright, white, and shining. By this ordered sequence, the southern and northern halves of the earth are to be understood as arranged accordingly.
It does not directly describe Pralaya; it focuses on a cosmographic observation—waters appearing luminous at night—and uses it to explain an ordered arrangement of the earth’s northern and southern halves.
Indirectly, it supports dharmic governance and household order by emphasizing krama (proper sequence) and correct directional understanding—principles used in planning settlements, rites, and regulated living.
The verse reinforces directional logic (dakṣiṇa/uttara) and ordered sequencing (krama-yoga), foundational for Vastu-based layout decisions and for orienting ritual spaces according to cosmographic principles.