सोमवर्णनम्
Graha–Ratha–Aśva Varṇana, Dhruva-Nibaddha Gati, Maṇḍala-Pramāṇa, Graha-Arcana
उत्तरासु च वीथीषु व्यन्तरास्तमनोदयौ पौर्णिमावास्ययोर् ज्ञेयौ ज्योतिश्चक्रानुवर्तिनौ
uttarāsu ca vīthīṣu vyantarāstamanodayau paurṇimāvāsyayor jñeyau jyotiścakrānuvartinau
In the northern celestial tracks (vīthīs), the Vyantaras are to be known as presiding over sunset and sunrise on the full-moon and new-moon days; they move in accord with the revolving wheel of the luminaries.
Suta Goswami
It grounds Shiva-puja in sacred timing: Purnima and Amavasya are highlighted as cosmically governed junctions, suitable for vrata, japa, and offerings to the Linga in harmony with the jyotiṣ-cakra under Pati (Shiva).
By implying an ordered “wheel of lights” that beings follow, it points to Shiva as Pati—the sovereign regulator of cosmic law (ṛta) behind celestial motion, while pashus (souls) benefit by aligning their conduct with that order.
Observance of Amavasya and Purnima disciplines—fasting, purification, japa, and Linga-archana—supporting Pashupata-style inner regulation (niyama) by syncing practice with sunrise/sunset and lunar transitions.