Tithi-vicara
Determination of Tithi for Fasts, Parana, and Pitri Rites
तिथिप्रमाणं विप्रेंद्राः क्षपाकरदिवाकरौ । चंद्रार्कचारविज्ञानात्कालं कालविदो विदुः ॥ १७ ॥
tithipramāṇaṃ vipreṃdrāḥ kṣapākaradivākarau | caṃdrārkacāravijñānātkālaṃ kālavido viduḥ || 17 ||
হে বিপ্ৰেন্দ্ৰসকল! তিথিৰ প্ৰমাণ চন্দ্ৰ আৰু সূৰ্য। চন্দ্ৰ-সূৰ্যৰ গতি-বিজ্ঞানৰ দ্বাৰা কালবিদসকলে কালক জানে।
Narada (teaching the assembled sages/brāhmaṇas)
Vrata: none
Primary Rasa: shanta
Secondary Rasa: adbhuta
It frames sacred observance as aligned with cosmic order: knowing tithi through Sun–Moon motion ensures vratas and rites are performed at the correct time, honoring ṛta (the lawful rhythm of the universe).
Bhakti practices (fasts, pūjā, Ekādaśī-like observances) depend on proper timing; the verse supports devotion by grounding worship in accurate tithi reckoning rather than guesswork.
Jyotiṣa Vedāṅga: determining tithi and kāla by calculating/observing the Moon’s and Sun’s courses (candrārka-cāra), a key tool for calendrics and ritual scheduling.