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 ||
应取太阳与月亮合计度量之半,乘以六十而后除算;所得之数再以二者每日运行差分而除,即得其“停驻”之半时(即合相或冲相之时长),以那底迦等单位表示。
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’).