Matsya Purana — Solar–Lunar Motions
स्थानं जरद्गवं मध्ये तथैरावतमुत्तमम् वैश्वानरं दक्षिणतो निर्दिष्टमिह तत्त्वतः //
sthānaṃ jaradgavaṃ madhye tathairāvatamuttamam vaiśvānaraṃ dakṣiṇato nirdiṣṭamiha tattvataḥ //
In the middle, the place of Jaradgava is to be set, and likewise that of the excellent Airāvata. On the southern side, Vaiśvānara is here prescribed—truly, in accordance with the correct principle.
This verse does not discuss pralaya; it gives a Vastu-vidya rule about where specific deities/figures are to be positioned within a sacred architectural grid.
It supports the duty of establishing buildings and ritual spaces correctly—kings (as patrons of temples/towns) and householders (in domestic rites) are to follow prescribed directional placements to maintain auspicious order.
It specifies Vastu-mandala placement: Jaradgava and Airāvata are assigned to the central zone, while Vaiśvānara is assigned to the southern side, indicating a technical rule for layout in temple/ritual design.