Tithi-Nirṇaya for Vratas: Ekādaśī Rules, Saṅkrānti Punya-kāla, Eclipse Observances, and Prāyaścitta
उपोषितव्यं नक्षत्रं येनास्तं याति भास्करः । तिथिनक्षत्रसंयोगविहितव्रतकर्मणि ॥ १० ॥
upoṣitavyaṃ nakṣatraṃ yenāstaṃ yāti bhāskaraḥ | tithinakṣatrasaṃyogavihitavratakarmaṇi || 10 ||
在依月日(tithi)与宿(nakṣatra)相合而制定的誓愿仪轨中,应于使太阳(Bhāskara)趋向落山的那一宿之时守斋。
Narada (teaching within a vrata-vidhi context; traditional dialogue setting with Sanatkumara lineage is implied for this section)
Vrata: none
Primary Rasa: shanta
Secondary Rasa: none
It teaches that a vrata is not only intention but also correct sacred timing—fasting should align with the prescribed tithi–nakṣatra combination and be carried through until the Sun’s setting, making the observance ritually complete.
By emphasizing disciplined vrata practice, it supports bhakti through regulated worship—devotion expressed as a timed, rule-based offering of self-control (upavāsa) dedicated to the deity according to śāstric injunction.
Jyotiṣa Vedāṅga: determining ritual eligibility by tithi–nakṣatra saṃyoga and using sunset (bhāskara-asta) as the practical boundary for completing the fast.