जे प्रोष्ठपदानाम्

Operational rule vidhi

In प्रोष्ठपद and its synonyms, the first vowel of the second member gets the वृद्धि before a तद्धित affix meaning 'born in that time' and having an indicatory ञ् , ण् or क् .

Word by word (padaccheda)

Right context जे saptamī · ekavacanaTarget प्रोष्ठपदानाम् ṣaṣṭhī · bahuvacana

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").
Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).

Dotted words are technical terms, dashed ones pratyāhāras (names for classes of sounds or affixes). Hover or tap one to see its card.

Full reading

जे प्रोष्ठपदानाम्

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

Commentary

In प्रोष्ठपद and its synonyms, the first vowel of the second member gets the वृद्धि before a तद्धित affix meaning 'born in that time' and having an indicatory ञ् , ण् or क् ।
The word ज means 'born', the affixes denoting 'born under that asterism' are meant here. प्रोष्ठपद is the name of an asterism, the time appertaining there to is also called प्रोष्ठपद (the affix अण् of 4.3.3, is elided by IV.2.4). प्रोष्ठपदासु जातः = प्रोष्ठपादो माणवकः (with अण् 4.3.16). Why do we say 'born in that time'? Observe यदा प्रौष्ठपदोमेघः (= प्रोष्ठपदासु भवः) धरणीमभिवर्षति ॥ The plural number प्रोष्ठपदानां indicates that the synonyms of प्रोष्ठपद such as भद्रपाद are also to be included.

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