Pāṇini sūtras

The affix aṇ already ordained IV.1.83 comes after a word in the instrumental case in construction, which is the name of a lunar mansion, to signify a time connected with the asterism.

1. nakṣatreṇaनक्षत्रेण

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   nन्	nakṣatraनक्षत्र	nakṣatreṇaनक्षत्रेण	NakṣatraNअक्षत्र	nakṣatrनक्षत्र् + plus eṇaएण

2. yuktaḥयुक्तः

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   yय्	yujयुज्	yuktaḥयुक्तः	join	yuktयुक्त् + plus aḥअः

3. kālaḥकालः

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   kक्	kālaकाल	kālaḥकालः	time	kālकाल् + plus aḥअः

Anuvṛtti

1. tenaतेन 4·2·1

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   tत्	tadतद्	tenaतेन	instrumental	tadतद् + plus aअ