Narada Purana — Purva Bhaga, Shloka 148
Graha–Ketu–Utpāta Lakṣaṇas: Solar/Lunar Omens, Comets, Eclipses, and Calendar Rules
कृष्णापंचदशी माघे द्वापरादिरुदीरिता । कल्पादिः स्यात्कृष्णपक्षे नभस्यस्य त्रयोदशी ॥ १४८ ॥
kṛṣṇāpaṃcadaśī māghe dvāparādirudīritā | kalpādiḥ syātkṛṣṇapakṣe nabhasyasya trayodaśī || 148 ||
It is taught that the beginning of the Dvāpara falls on the Amāvāsyā—Kṛṣṇā Pañcadaśī—in the month of Māgha; and that the commencement of a Kalpa occurs on the dark‑fortnight thirteenth tithi, Trayodaśī, in the month of Nabhasya (Bhādrapada).
Sanatkumara (in dialogue with Narada)
Vrata: none
Primary Rasa: shanta
Secondary Rasa: adbhuta
FAQs
It links cosmic cycles (yuga and kalpa) to sacred lunar time (tithi and month), showing that dharmic life and contemplation of liberation are grounded in precise, sanctified time-reckoning.
By emphasizing holy calendrical moments, it supports disciplined observance—choosing auspicious tithis for worship and vows—so devotion becomes steady and aligned with sacred time.
Vedāṅga Jyotiṣa: the practical use of lunar months and tithis (Amāvāsyā, Trayodaśī; Māgha, Nabhasya/Bhādrapada) to mark ritual and cosmological commencements.