Matsya Purana — Intermediate Dissolution
स सिसृक्षुर् अभूद् देवः प्रजापतिर् अरिन्दम तत्तेजसश् च तत्रैष मार्तण्डः समजायत //
sa sisṛkṣur abhūd devaḥ prajāpatir arindama tattejasaś ca tatraiṣa mārtaṇḍaḥ samajāyata //
O subduer of foes, that divine one arose as Prajāpati with the will to create; and from that very radiance, there in that place, Mārtaṇḍa—the Sun—was born.
It describes creation (sarga), stating that Prajāpati’s intention to create manifests radiance from which Mārtaṇḍa (the Sun) is born—an origin-point for cosmic order rather than a pralaya event.
By grounding kingship and household life in cosmic order: the Sun’s birth signifies time, seasons, and duty-bound rhythms (work, sacrifice, governance), implying that righteous rule and disciplined living align with the solar order.
No direct Vāstu rule is stated, but the Sun’s emergence is a key ritual anchor for solar-oriented rites (daily sandhyā, timekeeping) and for Vāstu considerations that prioritize light and auspicious eastern orientation.