Matsya Purana — Cosmic Architecture of Sun–Moon and the ‘Houses of the Gods’
तुल्यो भूत्वा तु स्वर्भानुस् तदधस्तात्प्रसर्पति उद्धूत्य पार्थिवीं छायां निर्मितां मण्डलाकृतिम् //
tulyo bhūtvā tu svarbhānus tadadhastātprasarpati uddhūtya pārthivīṃ chāyāṃ nirmitāṃ maṇḍalākṛtim //
Assuming a like form, Svarbhānu then glides beneath it, sweeping up an earthly, circular shadow fashioned in the shape of a disc.
This verse is not about pralaya; it explains a cosmological mechanism for eclipses, portraying Svarbhānu (Rāhu) as moving beneath and producing a disk-like shadow.
Indirectly, it supports the Purāṇic ideal that rulers and householders should respect calendrical and celestial timings (e.g., eclipses) for vows, gifts, and rites—since such events are treated as ritually significant omens and occasions.
Ritually, eclipses (grahaṇa) are associated with heightened observances—bathing, japa, dāna, and expiatory practices—while the verse’s “maṇḍala” (disk) imagery also resonates with mandala-based sacred geometry used in yantra and ritual layouts, though no direct Vāstu rule is stated here.