Tithi-Nirṇaya for Vratas: Ekādaśī Rules, Saṅkrānti Punya-kāla, Eclipse Observances, and Prāyaścitta
परविद्धाः प्रशस्ताः स्युर्न ग्राह्याः पूर्वसंयुताः । नागविद्धा तु या षष्टी शिवविद्धा तु सप्तमी ॥ ४ ॥
paraviddhāḥ praśastāḥ syurna grāhyāḥ pūrvasaṃyutāḥ | nāgaviddhā tu yā ṣaṣṭī śivaviddhā tu saptamī || 4 ||
Тити, «переходящие в следующий день» (паравиддха), считаются похвальными; а тити, «соединённые с предыдущим днём» (пурва-самьюта), принимать не следует. Следует избегать Шаштхи, «пронзённой» Нагой, и также Саптами, «пронзённой» Шивой.
Narada (teaching tithi/vṛta-nirṇaya principles in the Narada Purana tradition)
Vrata: none
Primary Rasa: shanta
Secondary Rasa: bhayanaka
It emphasizes dharmic precision in observances: choosing the correct tithi-lakṣaṇa (timing characteristics) safeguards the purity and fruit of a vrata, showing that devotion should be supported by proper ritual discernment.
Bhakti is not presented as careless sentiment; the verse implies that sincere worship is strengthened when aligned with śāstra-based timing (tithi-nirṇaya), avoiding doṣa-tainted days that can weaken the intended religious merit.
It highlights Vedāṅga Jyotiṣa/Pañcāṅga practice: determining whether a tithi is paraviddhā or pūrvasaṃyutā and recognizing specific ‘viddha’ doṣas (Nāga-viddhā, Śiva-viddhā) while fixing vrata dates.