Narada Purana — Purva Bhaga, Shloka 37
Tithi-Nirṇaya for Vratas: Ekādaśī Rules, Saṅkrānti Punya-kāla, Eclipse Observances, and Prāyaścitta
यागकालः स विज्ञेयः प्रातरुक्तो मनीषिभिः । मध्याह्नद्वितये स्याताममावास्या च पूर्णिमा ॥ ३७ ॥
yāgakālaḥ sa vijñeyaḥ prātarukto manīṣibhiḥ | madhyāhnadvitaye syātāmamāvāsyā ca pūrṇimā || 37 ||
ヤーガ（聖なる供犠）の正しい時は、賢者の説くとおり朝であると知るべきである。アマーヴァーシャー（新月日）とプールṇिमā（満月日）は、正午前後の二つの時刻に守持すべきである。
Narada (in instruction on ritual timing, within the Narada–Sanatkumara dialogue framework)
Vrata: none
Primary Rasa: shanta
Secondary Rasa: bhakti
FAQs
It emphasizes kāla (proper timing) as a core factor of dharma: when an act of worship is performed at the prescribed time, it becomes ritually complete and yields its intended spiritual fruit.
Bhakti in the Purāṇic sense is supported by disciplined observance; the verse frames devotion as not only heartfelt worship but also timely worship—aligning one’s practice with sacred lunar days like Amāvāsyā and Pūrṇimā.
It points to Vedāṅga-style time-reckoning used in ritual practice—practical calendrical/astronomical awareness (jyotiṣa-oriented kāla-nirṇaya) for fixing yāga, Amāvāsyā, and Pūrṇimā observances.