Tithi-Nirṇaya for Vratas: Ekādaśī Rules, Saṅkrānti Punya-kāla, Eclipse Observances, and Prāyaścitta
दशम्येकादशीविद्धा नोपोष्याः स्युः कदाचन । दर्शं च पौर्णमासीं च सत्पमीं पितृवासरम् ॥ ५ ॥
daśamyekādaśīviddhā nopoṣyāḥ syuḥ kadācana | darśaṃ ca paurṇamāsīṃ ca satpamīṃ pitṛvāsaram || 5 ||
One should never fast on an Ekādaśī tainted by Daśamī. Likewise, one should not fast on the Darśa (new-moon day), the Paurṇamāsī (full-moon day), the Saptamī, or on a day set apart for rites to the ancestors (Pitṛ-vāsara).
Narada (teaching in a vrata/kalā-nirṇaya context; dialogue tradition primarily with Sanatkumara lineage)
Vrata: Ekādaśī upavāsa (by implication)
Primary Rasa: shanta
Secondary Rasa: bhayanaka
It stresses dharmic precision in vrata practice: the merit of fasting depends on correct tithi timing, and certain days are reserved for other sacred functions (moon rites and ancestral rites).
Bhakti is expressed through disciplined observance of Viṣṇu-related vows like Ekādaśī; the verse teaches that devotion is not only emotion but also correct, scripture-aligned practice.
Vedāṅga-aligned calendrical decision-making (tithi-nirṇaya): avoiding daśamī-viddhā Ekādaśī and recognizing restricted tithis like Darśa, Paurṇamāsī, and Pitṛ-related days for appropriate rites.