सूर्यरथनिर्णयः (चन्द्रस्य पक्षवृद्धिक्षयविधानम्)
पिबन्ति द्विकलं कालं शिष्टा तस्य कला तु या निसृतं तदमावास्यां गभस्तिभ्यः स्वधामृतम्
pibanti dvikalaṃ kālaṃ śiṣṭā tasya kalā tu yā nisṛtaṃ tadamāvāsyāṃ gabhastibhyaḥ svadhāmṛtam
พวกเขาดื่มนั้นตลอดกาลสองกะลา; ส่วนกะลาที่เหลือของท่าน เมื่อไหลออกในคืนอมาวาสยา ก็กลายเป็นอมฤตแห่งรัศมีของตนเอง อันเกิดจากลำแสงทั้งหลาย
Suta Goswami
It links sacred time (kāla) and lunar phases (kalā, Amāvāsyā) to the flow of sustaining nectar, implying that Shiva-pūjā aligned with tithi—especially Amāvāsyā—harmonizes the worshipper with the cosmic ordinance upheld by Pati (Shiva).
Though Soma is named, the teaching reflects Shiva-tattva as the regulator of kāla and kalā: the measured outflow and remainder indicate an ordered cosmic economy where time and nourishment function under the Supreme Lord’s governance.
Tithi-based observance—especially Amāvāsyā discipline (vrata, japa, and Shiva-archana)—is implied, emphasizing purification of the pashu (individual soul) by aligning practice with cosmic rhythms rather than random timing.