Narada Purana — Purva Bhaga, Shloka 39
Tithi-Nirṇaya for Vratas: Ekādaśī Rules, Saṅkrānti Punya-kāla, Eclipse Observances, and Prāyaścitta
पूर्वद्वये परेद्युः स्यात्संगवात्परतो मनीषिभिः । सद्यः कालः परेद्युः स्याज्ज्ञेयमेवं तिथिक्षये ॥ ३९ ॥
pūrvadvaye paredyuḥ syātsaṃgavātparato manīṣibhiḥ | sadyaḥ kālaḥ paredyuḥ syājjñeyamevaṃ tithikṣaye || 39 ||
ティティの消失（tithi-kṣaya）が起こるとき、賢者は最初の二つの時分では「翌日」（paredyuḥ）を適用すると説く。だがサンガヴァの時刻を過ぎれば、「当日の時」は「翌日」に属すると知るべきである—これがティティ消滅の理解である。
Sanatkumara (teaching Narada)
Vrata: none
Primary Rasa: shanta
Secondary Rasa: adbhuta
FAQs
It safeguards dharma by ensuring vows and worship are performed at the correct sacred time; accurate kāla (time) is treated as an essential support for meritorious action.
Bhakti practices like vrata, pūjā, and upavāsa depend on proper tithi timing; the verse provides a rule so devotion is aligned with śāstric time-reckoning even during tithi-kṣaya.
Vedāṅga Jyotiṣa (astronomical calendrics): it gives a decision rule using saṅgava and day-divisions to assign ‘same-day time’ to the next day when a tithi is lost.