Jyotiṣa-śāstra Saṅgraha: Threefold Division, Gaṇita Methods, Muhūrta, and Planetary Reckoning
रवींद्वोर्मानयोगार्द्धं षष्ट्या संगुण्य भाजयेत् । तयोर्भुक्तयंतरेणाप्तं स्थित्यमर्द्धां नाडिकादिवत् ॥ १८४ ॥
ravīṃdvormānayogārddhaṃ ṣaṣṭyā saṃguṇya bhājayet | tayorbhuktayaṃtareṇāptaṃ sthityamarddhāṃ nāḍikādivat || 184 ||
Qu’on prenne la moitié de la mesure réunie du Soleil et de la Lune, qu’on la multiplie par soixante puis qu’on la divise. Le résultat, divisé par la différence de leurs mouvements quotidiens, donne la demi-durée de leur « séjour » (temps de conjonction ou d’opposition), exprimée en nāḍikās et autres unités.
Narada (teaching a technical rule within the Moksha-Dharma section, drawing on Vedanga-style computation)
Vrata: none
Primary Rasa: shanta
Secondary Rasa: adbhuta
It shows that Dharma and Moksha-oriented life in the Narada Purana is supported by precise kāla-nirṇaya (time-determination), because correct timing underlies vrata, japa, and other sacred observances.
Bhakti practices often depend on proper tithi and lunar-solar calculations; this verse provides a computational tool so devotional rites can be performed at the intended sacred time without error.
Vedāṅga Jyotiṣa: using the Sun–Moon measures, their bhukti (daily motion), and nāḍikā-based time units to compute the duration of a celestial condition (their ‘stay’).