Tithi-Nirṇaya for Vratas: Ekādaśī Rules, Saṅkrānti Punya-kāla, Eclipse Observances, and Prāyaścitta
द्वादश्यां विद्यते किंचिद्दशमीसंयुता यदि । दिनक्षये द्वितीयैव सर्वेषां परिकीर्तितां ॥ ४६ ॥
dvādaśyāṃ vidyate kiṃciddaśamīsaṃyutā yadi | dinakṣaye dvitīyaiva sarveṣāṃ parikīrtitāṃ || 46 ||
若在十二日(Dvādaśī)中仍有哪怕一丝与第十日(Daśamī)的相合,则至日终之时,唯有“第二日(第二tithi)”被宣示为一切人应当守持者。
Sanatkumara (in dialogue with Narada)
Vrata: Ekadashi (context: pāraṇā/selection around Dvādaśī)
Primary Rasa: shanta
Secondary Rasa: none
It teaches that vows (vratas) must be performed with correct tithi-judgment (nirṇaya); accuracy in timing preserves the sanctity and fruit of the observance.
By emphasizing precise observance of sacred days like Dvādaśī in alignment with the pañcāṅga, it supports disciplined Vishnu-bhakti where devotion is expressed through regulated vrata practice.
It reflects Jyotiṣa/Vedāṅga application—tithi conjunction (saṁyoga) and day-end (dina-kṣaya) rules used to decide the proper observance day in Narada Purana rituals.