Jyotiṣa-śāstra Saṅgraha: Threefold Division, Gaṇita Methods, Muhūrta, and Planetary Reckoning
मासीकृतायुता मासैर्मधुशुक्लादिभिर्गतैः । पृथक्त्थासिधिमासग्रासूर्यमासविभाजिताः ॥ ७७ ॥
māsīkṛtāyutā māsairmadhuśuklādibhirgataiḥ | pṛthaktthāsidhimāsagrāsūryamāsavibhājitāḥ || 77 ||
When the reckoning is converted into months—counted through the months known as Madhu, Śukla, and the rest—it is further distinguished into separate kinds: the Sthāsi (civil) month, the Dhi (lunar) month, the Grāsa (synodic) month, and the Sūrya (solar) month.
Sanatkumara (teaching Narada in a Moksha-Dharma context with technical time-reckoning details)
Vrata: none
Primary Rasa: shanta
Secondary Rasa: none
It grounds Dharma and Moksha-oriented practice in correct kāla (time) knowledge, showing that sacred observances depend on precise calendrical divisions rather than vague “month” counting.
Bhakti practices like vrata, festival worship, and Viṣṇu-related observances become spiritually effective when performed in the properly defined month (lunar/solar), so devotion is supported by accurate time-reckoning.
Vedāṅga Jyotiṣa: the classification of months (māsa-bheda)—civil, lunar, synodic, and solar—used to time rituals, fasts, and calendrical calculations.