Matsya Purana — Cosmography of Jambūdvīpa: Varṣas
सप्तैव तु प्रवक्ष्यामि चन्द्रादित्यग्रहैः सह तेषां मनुष्यतर्केण प्रमाणानि प्रचक्षते //
saptaiva tu pravakṣyāmi candrādityagrahaiḥ saha teṣāṃ manuṣyatarkeṇa pramāṇāni pracakṣate //
“I shall explain only the seven (planets), together with the Moon and the Sun; and I shall state their measures (and the validating computations) as they are ascertained through human reasoning.”
This verse is not describing pralaya; it introduces an astronomy-focused explanation of the Sun, Moon, and seven planets, emphasizing measurable standards rather than flood or dissolution narratives.
By grounding planetary measures in “human reasoning,” it supports practical Jyotiṣa used for calendars, auspicious timings, and governance/household rites—tools traditionally applied in royal administration and domestic ritual planning.
Indirectly ritual: accurate graha measures underpin tithi/nakṣatra-based scheduling for yajñas, consecrations, and temple festivals—key timing inputs often paired with Vāstu and pratimā-pratiṣṭhā procedures in Purāṇic practice.