Amāvasyā-Pitṛtarpaṇa: Purūravas and the Soma-Based Ancestral Offering (अमावस्या-पितृतर्पण / सोमतर्पण-विधि)
प्रतिपत्प्रतिपद्येत पर्वकालो द्विमात्रकः / कालः कहूसिनीवाल्योः सामुद्रस्य तु मध्यतः
pratipatpratipadyeta parvakālo dvimātrakaḥ / kālaḥ kahūsinīvālyoḥ sāmudrasya tu madhyataḥ
From pratipadā to pratipadā, the parva-time measures two mātrās; and the time of Kuhū and Sinīvālī is said to lie in the very middle of the sāmudra (oceanic) reckoning.