Narada Purana — Purva Bhaga, Shloka 78
Jyotiṣa-śāstra Saṅgraha: Threefold Division, Gaṇita Methods, Muhūrta, and Planetary Reckoning
अथाधिमासकैर्युक्ता दिनीकृत्य दिनान्विताः । द्विस्थास्तितिक्षयाभ्यस्ताश्चांद्रवासरभाजिताः ॥ ७८ ॥
athādhimāsakairyuktā dinīkṛtya dinānvitāḥ | dvisthāstitikṣayābhyastāścāṃdravāsarabhājitāḥ || 78 ||
次いで、閏月（アディマーサ）によって調整されたのち、（太陰の計算）は日数の数えへと改められ、日として表される。二つの位置に配され、ティティの増加と欠落という伸長・減少の理に習い、月の曜日—すなわち太陰の日数体系—に従って配分される。
Sanatkumara (teaching Narada)
Vrata: none
Primary Rasa: shanta
Secondary Rasa: adbhuta
FAQs
It emphasizes that correct sacred timing (kāla-niyama) for vrata and ritual duty depends on precise calendrical reconciliation—especially the use of adhika-māsa and the handling of tithi variation—so dharma is practiced in harmony with cosmic order.
Bhakti practices such as Ekādaśī, fasts, and festival worship rely on accurate tithi and month determination; this verse supports devotion by ensuring observances are performed on their proper lunar dates, strengthening niyama (disciplined worship).
Vedāṅga Jyotiṣa (astronomical/astrological timekeeping): the adjustment via adhika-māsa, converting lunar reckonings into day-counts, and accounting for tithi increase/loss (vriddhi/kṣaya) when mapping lunar time to weekdays.