Tithi-Nirṇaya for Vratas: Ekādaśī Rules, Saṅkrānti Punya-kāla, Eclipse Observances, and Prāyaścitta
ह्नासवृद्धिविशून्या चेत् ग्राह्यापूर्वा तथा परा । ज्येष्ठासंमिश्रितं मूलं रोहिणी वह्निंसंयुता ॥ १५ ॥
hnāsavṛddhiviśūnyā cet grāhyāpūrvā tathā parā | jyeṣṭhāsaṃmiśritaṃ mūlaṃ rohiṇī vahniṃsaṃyutā || 15 ||
If a given configuration is free from both decline and increase, then both Pūrvā and Parā (nakṣatras) are acceptable. Mūla when mixed with Jyeṣṭhā, and Rohiṇī when conjoined with Agni (a fiery influence), are to be treated with special consideration in electional timing.
Sanatkumara (teaching Narada)
Vrata: none
Primary Rasa: shanta
Secondary Rasa: bhayanaka
It frames Jyotiṣa as a dharmic support-system: by avoiding unstable ‘decline/increase’ conditions and noting sensitive star-combinations, one aligns ritual timing with cosmic order (ṛta), reducing obstacles to sacred acts.
Indirectly: bhakti-practices (vratas, pūjā, saṃskāras) are strengthened when performed at proper muhūrta; the verse supplies technical criteria so devotional acts can be undertaken with fewer impediments.
Vedāṅga Jyotiṣa—specifically muhūrta/electional rules using nakṣatras and their combinations (e.g., Pūrvā/Parā acceptability, and cautions about Mūla–Jyeṣṭhā and Rohiṇī with a fiery/Agni influence).