The Exposition of the Dvādaśī Vow for the Twelve Months
Dvādaśī-vrata-nirṇaya and Mahā-dvādaśī Lakṣaṇas
श्रवणर्क्षयुतायां च द्वादश्यां भाद्रशुक्लके । ऊर्ज्जे सितायां द्वादश्यामंत्यभे च व्रतद्वयम् ॥ ११५ ॥
śravaṇarkṣayutāyāṃ ca dvādaśyāṃ bhādraśuklake | ūrjje sitāyāṃ dvādaśyāmaṃtyabhe ca vratadvayam || 115 ||
Dans la quinzaine claire de Bhādrapada, lorsque Dvādaśī est jointe au nakṣatra Śravaṇa; et dans la quinzaine claire d’Ūrja (Āśvina), lorsque Dvādaśī tombe sous le dernier nakṣatra (Revatī), deux vœux (vrata) distincts doivent être observés.
Narada
Vrata: Dvādaśī-vrata (instruction: vratadvayam—two vows—to be observed on specified yogas)
Primary Rasa: shanta
Secondary Rasa: none
It teaches that vrata-results depend on precise sacred timing—tithi (Dvādaśī) harmonized with nakṣatra (Śravaṇa/Revatī)—showing Dharma as both devotion and disciplined alignment with cosmic order.
By prescribing specific Dvādaśī-based vratas, it directs devotion into regulated worship and fasting practices traditionally offered to Viṣṇu, where correct observance becomes an act of bhakti.
Jyotiṣa (Vedāṅga astrology): it uses the calendrical science of tithi (Dvādaśī), pakṣa (bright fortnight), lunar months (Bhādrapada/Ūrja), and nakṣatra (Śravaṇa/Revatī) to determine ritual timing.