Narada Purana — Purva Bhaga, Shloka 172
Jyotiṣa-śāstra Saṅgraha: Threefold Division, Gaṇita Methods, Muhūrta, and Planetary Reckoning
वक्रर्त्वोर्गतियोगामं गम्येतीते दिनादिकम् । खनत्यासंस्कृतौव्वेषूदक्साम्येन्येंतरं युतिः ॥ १७२ ॥
vakrartvorgatiyogāmaṃ gamyetīte dinādikam | khanatyāsaṃskṛtauvveṣūdaksāmyenyeṃtaraṃ yutiḥ || 172 ||
Par la conjonction du mouvement d’une planète et de sa saison de rétrogradation, on doit déterminer les mesures de temps écoulées et restantes, tels les jours et autres. Dans les calculs touchant l’excavation et d’autres opérations encore grossières, la correction s’obtient en prenant la moyenne selon l’égalité des directions (les quatre quartiers).
Sanatkumara (in instruction to Narada)
Vrata: none
Primary Rasa: shanta
Secondary Rasa: adbhuta
FAQs
It frames accurate time-reckoning as a dharmic discipline: understanding motion and time supports correct observance of vrata, worship timings, and orderly life conducive to moksha.
Bhakti practice depends on proper sacred timing (days, observances, fasts). The verse underlines that devotion is strengthened when rituals and vows are aligned with correct calendrical and astral calculations.
Vedanga Jyotisha—using planetary motion (including retrograde periods) to compute elapsed/remaining time units, and applying a ‘mean/equalization’ correction method in rough or uncorrected calculations.