Jyotiṣa-śāstra Saṅgraha: Threefold Division, Gaṇita Methods, Muhūrta, and Planetary Reckoning
रेखा प्राच्यपरा साध्या विषुवद्भाग्रया तथा । इष्टच्छायाविषुवतोर्मध्येह्यग्राभिधीयते ॥ १३४ ॥
rekhā prācyaparā sādhyā viṣuvadbhāgrayā tathā | iṣṭacchāyāviṣuvatormadhyehyagrābhidhīyate || 134 ||
ಪೂರ್ವಮುಖವಾಗಿ ಒಂದು ರೇಖೆಯನ್ನು ಎಳೆಯಬೇಕು; ಹಾಗೆಯೇ ವಿಷುವತ್ (ಪೂರ್ವ–ಪಶ್ಚಿಮ) ರೇಖೆಯನ್ನೂ. ಇಷ್ಟ ಛಾಯಾ-ಚಿಹ್ನ ಮತ್ತು ವಿಷುವತ್ ಚಿಹ್ನಗಳ ಮಧ್ಯದಲ್ಲಿರುವ ಮಧ್ಯಬಿಂದು ‘ಅಗ್ರಾ’ ಎಂದು ಕರೆಯಲ್ಪಡುತ್ತದೆ।
Sanatkumara (teaching Narada in a technical-vedanga style passage)
Vrata: none
Primary Rasa: shanta
Secondary Rasa: bhakti
It shows that dharma and moksha-oriented life in the Purana is supported by precise knowledge (vidyā): correct orientation and time-reckoning (through shadow and equinoctial markers) safeguard the accuracy of rites and disciplined living.
While not directly a bhakti-verse, it supports bhakti-practice indirectly: accurate determination of direction and time helps perform Vishnu-oriented worship, vrata timings, and daily observances with steadiness and correctness.
Vedāṅga Jyotiṣa and chāyā-gaṇita (shadow-based measurement): drawing an east-oriented line, using the equinoctial (viṣuvat) reference, and defining a midpoint marker (agrā) for further calculation or alignment.