सप्तनोऽञ् छन्दसि

Operational rule vidhi

The affix अञ् (+/- अ) comes after the word सप्तन् in the छन्दस् (Vedas) when the meaning is that of a वर्ग.

Word by word (padaccheda)

Left context सप्तनः pañcamī · ekavacanaSubstitute / term अ prathamā · ekavacanaRight context छन्दसि saptamī · 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.
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").

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Pink letters are it-markers (anubandhas), tags dropped by 1.3.9. Hover or tap one for the rule that marks it, or try the it-letter finder.

Full reading

सप्तनः अञ् छन्दसि

Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.

Commentary

The affix अञ् (+/- अ) comes after the word सप्तन् in the छन्दस् (Vedas) when the meaning is that of a वर्ग।
As सप्त साप्तान्यसृजन् ॥ The phrase तदस्य परिमाणं is understood here.

Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.