Matsya Purana — Navagraha Sacrifice for Planetary Pacification and Prosperity
पूर्वेण भार्गवं विद्यात् सोमं दक्षिणपूर्वके पश्चिमेन शनिं विद्याद् राहुं पश्चिमदक्षिणे पश्चिमोत्तरतः केतुं स्थापयेच्छुक्लतण्डुलैः //
pūrveṇa bhārgavaṃ vidyāt somaṃ dakṣiṇapūrvake paścimena śaniṃ vidyād rāhuṃ paścimadakṣiṇe paścimottarataḥ ketuṃ sthāpayecchuklataṇḍulaiḥ //
One should recognize Bhārgava (Śukra, Venus) in the east, Soma (the Moon) in the south-east, and Śani (Saturn) in the west; Rāhu is to be known in the south-west. In the north-west one should establish Ketu, using white grains of rice.
This verse does not address pralaya; it gives a Vastu/ritual rule for assigning planetary forces (grahas) to specific directions within a sacred layout.
For a king or householder commissioning a temple, altar, or consecrated space, correct directional placement of grahas is presented as part of proper ritual order—supporting auspiciousness, protection, and governance aligned with dharma.
It specifies direction-based installation/recognition of Venus, Moon, Saturn, Rāhu, and Ketu, and notes a ritual material—white rice grains—used to establish Ketu in the north-west sector of the layout.