गते वर्षद्वये सार्द्धे पंचपक्षे दिनद्वये । दिवसस्याऽष्टमे भागे पतत्येकोऽधिमासकः
gate varṣadvaye sārddhe paṃcapakṣe dinadvaye | divasasyā'ṣṭame bhāge patatyeko'dhimāsakaḥ
إذا مضت سنتان ونصف—ومعها خمسةُ أنصافِ شهرٍ (pakṣa) ويومان—فعند الجزء الثامن من اليوم يقع شهرٌ كبيسٌ واحد (adhimāsa).
Brahmā (deduced; Vaiṣṇavakhaṇḍa discourse style)
Scene: A learned jyotiṣin explains the occurrence of adhimāsa using a pañcāṅga and celestial diagrams; the moon’s phases and a time-wheel are depicted to show the intercalary adjustment.
Ritual observances depend on precise sacred time (kāla), and Purāṇas preserve calendrical rules for correct practice.
The calendrical rule is taught within the Ayodhyā Māhātmya context, supporting vrata practice at/connected to Ayodhyā.
It gives a rule for when an adhimāsa (intercalary month) occurs—relevant for timing long lunar vows.