Jyotiṣa-śāstra Saṅgraha: Threefold Division, Gaṇita Methods, Muhūrta, and Planetary Reckoning
वक्रिणश्चक्रशुद्धैस्तैरंशैरुजुतिवक्रताम् । क्रमज्या विषुवद्भाघ्नी क्षितिज्या द्वादशोद्धृता ॥ १२० ॥
vakriṇaścakraśuddhaistairaṃśairujutivakratām | kramajyā viṣuvadbhāghnī kṣitijyā dvādaśoddhṛtā || 120 ||
惑星軌道の修正された度数によって、順行の直進から逆行への偏差を定めるべし。次第の正弦(kramajyā)を分点の係数に乗じ、十二で割って地平の正弦(kṣitijyā)を得る。
Narada (teaching technical computation in the Purana’s instructional flow)
Vrata: none
Primary Rasa: shanta
Secondary Rasa: none
It frames Jyotiṣa (astronomical calculation) as a supporting sacred science—helping align ritual timing and dharma-practice with accurate knowledge of celestial motion.
Indirectly: by ensuring correct calendrical and astronomical determinations (tithi, graha-gati), devotees can observe vows and worship at the proper times, strengthening disciplined bhakti.
Vedāṅga Jyotiṣa and gaṇita: computing vakra (retrograde) deviation using corrected degrees, applying an equinoctial multiplier, and deriving kṣitijyā by a division-by-twelve rule.