Jyotiṣa-śāstra Saṅgraha: Threefold Division, Gaṇita Methods, Muhūrta, and Planetary Reckoning
वक्रिणश्चक्रशुद्धैस्तैरंशैरुजुतिवक्रताम् । क्रमज्या विषुवद्भाघ्नी क्षितिज्या द्वादशोद्धृता ॥ १२० ॥
vakriṇaścakraśuddhaistairaṃśairujutivakratām | kramajyā viṣuvadbhāghnī kṣitijyā dvādaśoddhṛtā || 120 ||
Gamit ang mga digring naituwid ng landas ng planeta, dapat tukuyin ang paglihis mula sa tuwid (direktang) galaw tungo sa pag-urong (retrograde). Ang sunod-sunod na sine (kramajyā) ay paramihin sa salik ng equinox, at ang sine ng abot-tanaw (kṣitijyā) ay makukuha sa paghahati sa labindalawa.
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.
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