4.3.19
छन्दसि ठञ्
Operational rule vidhi
In the छन्दस् (Vedas), the word वर्षा takes the affix ठञ् , in the remaining senses.
Word by word (padaccheda)
Right context छन्दसि saptamī · ekavacanaSubstitute / term prathamā · ekavacana
- Right context Saptamī (7th case): "when X follows", the operation applies to what precedes (1.1.66 तस्मिन्निति निर्दिष्टे पूर्वस्य). Also a condition or domain ("in the sense of").
- Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
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Full reading
छन्दसि ठञ्
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
In the छन्दस् (Vedas), the word वर्षा takes the affix ठञ् , in the remaining senses.
This debars ठक्. The form will be the same, but there will be difference in accent. As नभश्च नभस्यश्च वार्षिकावृतू ॥ The word ऋतु here means "month," i. e. Nabha and Navasya are two rainy months.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.