4.3.16
संधिवेलाद्यृतुनक्षत्रेभ्योऽण्
Operational rule vidhi
The affix अण् comes in the remaining senses after the words संधिवेला etc. and the words expressing 'season' and 'asterism'.
Word by word (padaccheda)
Left context संधिवेला- आदि- ऋतु- नक्षत्रेभ्यः pañcamī · bahuvacanaSubstitute / term अ prathamā · ekavacana
- Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
- 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
संधिवेला-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The affix अण् comes in the remaining senses after the words संधिवेला etc. and the words expressing 'season' and 'asterism'.
The word कालात् is to be read into the sutra. All the words must be expressive of time. This debars ठञ् ॥ The repetition of अण् debars छ also in the case of those words, which are Vriddha in this list 4.2.114. Thus (1) सान्धिवेलम्, सान्ध्यम् (2) ग्रैष्मम्, शैशिरम् (3) तेषम्, पौषम् are examples of sandhivela season and asterisms respectively.
The affix अण् is added to संवत्सर when denoting 'fruit' and 'festival', as सांवत्सरं फलं or पर्व ॥
1 संधिवेला, 2 संध्या, 3 अमावास्या, 4 त्रयोदशी, 5 चतुर्दशी, 6 पञ्चदशी, 7 पौर्णमासी, 8 प्रतिपद्, 9 संवत्सरात्फलपर्वणोः ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.