The Exposition of the Dvādaśī Vow for the Twelve Months
Dvādaśī-vrata-nirṇaya and Mahā-dvādaśī Lakṣaṇas
यदा त्वाषाढशुक्लायां द्वादश्यां मैत्रभं भवेत् । तदा व्रतद्वयं कार्य्यं न दोषोऽत्रैकदैवतम् ॥ ११४ ॥
yadā tvāṣāḍhaśuklāyāṃ dvādaśyāṃ maitrabhaṃ bhavet | tadā vratadvayaṃ kāryyaṃ na doṣo'traikadaivatam || 114 ||
Lorsque, dans la quinzaine claire d’Āṣāḍha, le douzième jour lunaire (Dvādaśī) tombe sous le nakṣatra Maitra, il convient d’accomplir les deux observances; en ce cas, il n’y a aucune faute à n’avoir qu’une seule divinité présidente pour le rite conjoint.
Narada (teaching in a vrata/kalā-nirṇaya context, traditionally within Narada–Sanatkumara dialogue framing)
Vrata: Dvādaśī-vrata (with instruction to perform vratadvaya—two observances—when the calendrical condition occurs)
Primary Rasa: shanta
Secondary Rasa: bhakti
It teaches that correct timing (tithi–nakṣatra alignment) can authorize combining observances, preserving dharma while maintaining the intended devotional merit of the vows.
By emphasizing vrata-performance on auspicious calendrical conditions, it supports disciplined worship—typically oriented to Viṣṇu on Dvādaśī—where devotion is expressed through regulated, scripture-guided practice.
Jyotiṣa (Vedāṅga astrology): it uses tithi (Dvādaśī) and nakṣatra (Maitra/Anurādhā) to decide ritual procedure, including when two vratas may be performed together without doṣa.