Matsya Purana — The Sun-Vow
विलिख्य विन्यसेत्सूर्यं नमस्कारेण पूर्वतः दिवाकरं तथाग्नेये विवस्वन्तमतः परम् //
vilikhya vinyasetsūryaṃ namaskāreṇa pūrvataḥ divākaraṃ tathāgneye vivasvantamataḥ param //
After drawing the figure, one should install Sūrya in the east in a posture of reverent salutation; likewise, one should place Divākara in the south-east, and thereafter Vivasvān in the next position.
This verse does not address Pralaya; it gives a Vastu/ritual prescription for drawing and installing solar forms in specific directions.
It supports the householder/kingly duty of commissioning correct temple or shrine layouts—placing deities according to prescribed directions to maintain ritual order (dharma) and auspiciousness.
It specifies directional installation of solar deities: Sūrya to the east in a namaskāra posture, Divākara to the south-east (āgneya), and Vivasvān next in the sequence—indicating a structured iconographic/mandala layout.