Matsya Purana — Cosmic Architecture of Sun–Moon and the ‘Houses of the Gods’
नक्षत्रमण्डलं चापि सोमादूर्ध्वं प्रसर्पति नक्षत्रेभ्यो बुधश्चोर्ध्वं बुधाच्चोर्ध्वं तु भार्गवः //
nakṣatramaṇḍalaṃ cāpi somādūrdhvaṃ prasarpati nakṣatrebhyo budhaścordhvaṃ budhāccordhvaṃ tu bhārgavaḥ //
Above Soma (the Moon) extends the nakṣatra-maṇḍala, the circle of the lunar mansions. Above the nakṣatras is Budha (Mercury), and above Budha is Bhārgava (Venus).
This verse is not about pralaya; it maps cosmic structure by placing the nakṣatra-sphere above the Moon and then listing Mercury and Venus above it, reflecting ordered cosmography rather than dissolution.
Indirectly, it supports dharma through correct time-reckoning: kings and householders rely on lunar mansions and planetary order for calendrical decisions—festivals, rites, and auspicious timings described across Purāṇic practice.
No direct Vāstu rule is stated, but such astral ordering underlies ritual calendrics used in temple consecrations and ceremonies—choosing nakṣatras and planetary conditions (graha-bala) for rites.