अनद्यतने र्हिलन्यतरस्याम्

Operational rule vidhi

The affix र्हिल् comes optionally in denoting time not of the current day after the words किम् , the सर्वनाम and बहु etc.

Word by word (padaccheda)

Right context अनद्यतने saptamī · ekavacanaSubstitute / term र्हि prathamā · ekavacanaRight context अन्यतरस्याम् saptamī · 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.

Dotted words are technical terms. Hover or tap one to see its card.

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

अनद्यतने र्हिल् अन्यतरस्याम्

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

Commentary

The affix र्हिल् comes optionally in denoting time not of the current day after the words किम् , the सर्वनाम and बहु etc.
The anuvritti of छन्दसि is not read into this sutra. This is a general rule. Thus कर्हि or कदा 7.2.103, यर्हि or यदा, तर्हि or तदा ॥

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