सूर्यरथनिर्णयः (चन्द्रस्य पक्षवृद्धिक्षयविधानम्)
स पौर्णमास्यां दृश्येत शुक्लः सम्पूर्णमण्डलः एवमाप्यायितं सोमं शुक्लपक्षे दिनक्रमात्
sa paurṇamāsyāṃ dṛśyeta śuklaḥ sampūrṇamaṇḍalaḥ evamāpyāyitaṃ somaṃ śuklapakṣe dinakramāt
在满月之夜,他显现为皎洁明亮、圆轮完满。如此在白半月中,苏摩按日次第而得滋养。
Suta Goswami (narrating the Purana to the sages of Naimisharanya)
It establishes sacred lunar timing—especially Purnima and the Shukla Paksha—as ritually potent periods for Shiva-upasana, when offerings and vrata are performed in harmony with cosmic increase (āpyāyana).
Indirectly, it points to Shiva as Pati who upholds ṛta (cosmic order): the waxing of Soma occurs in a lawful sequence, reflecting the Lord’s governance of time (kāla) and nourishment (puṣṭi) within creation.
A calendrical discipline: observing the waxing-fortnight sequence up to Purnima—useful for planning Somavara/Purnima vrata, abhisheka, and mantra-japa aligned with lunar increase.