सूर्यरथनिर्णयः (चन्द्रस्य पक्षवृद्धिक्षयविधानम्)
देवैः पीतं क्षये सोमम् आप्याययति नित्यशः पीतं पञ्चदशाहं तु रश्मिनैकेन भास्करः
devaiḥ pītaṃ kṣaye somam āpyāyayati nityaśaḥ pītaṃ pañcadaśāhaṃ tu raśminaikena bhāskaraḥ
When Soma (the Moon) wanes—having been “drunk” by the Devas—Bhāskara (the Sun) ever nourishes him anew; for fifteen days the Sun, with a single ray, restores what has been consumed.
Suta Goswami (narrating the cosmic order as taught in the Purana)
It grounds Shiva-puja in cosmic rhythm: tithi-based observances (especially Somavara and lunar phases) mirror the regulated replenishment of Soma, encouraging devotees to align worship with kala (sacred time) under Pati’s order.
Though Shiva is not named, the verse reflects Shiva-tattva as Pati—the supreme regulator of kala and niyati—by which even Devas and luminaries function in an ordered cycle of depletion and renewal.
Tithi-conscious vrata and sadhana: regulating practice across the bright and dark fortnights (śukla/kr̥ṣṇa pakṣa) supports steadiness of mind in Pashupata-oriented discipline, using lunar timing for japa, abhiṣeka, and vrata.