Matsya Purana — Navagraha Sacrifice for Planetary Pacification and Prosperity
ग्रहताराबलं लब्ध्वा कृत्वा ब्राह्मणवाचनम् गृहस्योत्तरपूर्वेण मण्डपं कारयेद्बुधः //
grahatārābalaṃ labdhvā kṛtvā brāhmaṇavācanam gṛhasyottarapūrveṇa maṇḍapaṃ kārayedbudhaḥ //
After ascertaining the auspicious strength of the planets and stars, and after having Brahmins recite benedictory texts, the wise person should have a maṇḍapa (ritual pavilion) constructed on the north‑eastern side of the house.
This verse does not address Pralaya; it focuses on auspicious preliminaries for construction—astral suitability and Brahminical recitation—within Vastu-oriented guidance.
It frames a householder’s (and by extension a patron-king’s) duty to begin construction in harmony with dharma: verify favorable cosmic timing (graha-tārā-bala) and sanctify the act through learned Brahmins’ auspicious recitations.
Architecturally, it prescribes placing the maṇḍapa on the north-east (uttara-pūrva/Iśānya), a highly auspicious Vastu zone; ritually, it requires Brahmin recitation and checking planetary-star strength before building.