Narada Purana — Purva Bhaga, Shloka 31
Tithi-Nirṇaya for Vratas: Ekādaśī Rules, Saṅkrānti Punya-kāla, Eclipse Observances, and Prāyaścitta
तत्र ग्राह्या सिनीवाली सायाह्नव्यापिनी तिथिः । अर्वाचीनक्षये चचैव सायाह्नव्यापिनी तथा ॥ ३१ ॥
tatra grāhyā sinīvālī sāyāhnavyāpinī tithiḥ | arvācīnakṣaye cacaiva sāyāhnavyāpinī tathā || 31 ||
In diesem Zusammenhang ist Sinīvālī nach dem Tithi zu nehmen, das bis in den späten Nachmittag (sāyāhna) hineinreicht. Ebenso ist, wenn das Tithi früher als erwartet endet, dennoch nach seiner Durchdringung des späten Nachmittags zu verfahren.
Narada (teaching tithi-determination as part of ritual timing)
Vrata: Sinīvālī-Amāvāsyā determination (for śrāddha/Amāvāsyā rites)
Primary Rasa: shanta
Secondary Rasa: none
FAQs
It teaches that dharma is upheld by correct timing: a vow like Sinīvālī gains its intended merit when observed on the properly prevailing tithi (especially by late-afternoon pervasion).
Bhakti is expressed through disciplined observance; the verse shows that devotion is not only feeling but also careful adherence to vrata-vidhi (rules), aligning worship with sacred time.
Jyotiṣa Vedāṅga: the rule of sāyāhna-vyāpti (tithi pervasion into late afternoon) for deciding which tithi is ‘grāhya’ (authoritative) when a tithi ends earlier than expected.