Matsya Purana — Solar–Lunar Motions
अस्य भारतवर्षस्य विष्कम्भात्तुल्यविस्तृतम् मण्डलं भास्करस्याथ योजनैस्तन्निबोधत //
asya bhāratavarṣasya viṣkambhāttulyavistṛtam maṇḍalaṃ bhāskarasyātha yojanaistannibodhata //
Now understand this: the solar disc (maṇḍala) is, in its extent, equal to the diameter of this Bhārata-varṣa—measured in yojanas.
This verse is not about Pralaya; it belongs to cosmographic description, giving a comparative measurement between Bhārata-varṣa’s diameter and the Sun’s disc in yojanas.
Directly, it does not prescribe royal or household duties; indirectly, such cosmographic knowledge supports the Purāṇic worldview used to frame dharma, pilgrimage geography, and calendrical/astronomical reckoning.
No explicit Vāstu or ritual rule is stated; however, the emphasis on measured dimensions (yojana-pramāṇa) reflects the Purāṇic concern for correct proportion and scale, a mindset also applied in temple planning and ritual layouts.