Matsya Purana — Solar–Lunar Motions
पर्यासपरिमाणं च चन्द्रादित्यौ प्रकाशतः पर्यासपारिमाण्यात्तु बुधैस्तुल्यं दिवः स्मृतम् //
paryāsaparimāṇaṃ ca candrādityau prakāśataḥ paryāsapārimāṇyāttu budhaistulyaṃ divaḥ smṛtam //
The measure of the circuit (paryāsa) is made manifest by the Moon and the Sun; and from that very measure of the circuit, the wise likewise declare the extent of the heavenly region (divaḥ) to be of equal measure.
This verse is not about Pralaya directly; it belongs to cosmography, explaining how the dimensions of celestial space are inferred through the Sun–Moon’s circuit (paryāsa), which would remain a reference-point in descriptions of cosmic order across cycles.
Indirectly, it supports dharma through correct reckoning of time and cosmic order—knowledge used for calendars, rites, and governance. A king and householder rely on such astral measures for auspicious timings (muhūrta) and orderly ritual observance.
The verse itself is astronomical, but its practical ritual value lies in establishing time-reckoning via the Sun and Moon—foundational for scheduling yajñas, vratas, and temple festivals (a key applied interface between Jyotiṣa and ritual practice).