Amāvasyā-Pitṛtarpaṇa: Purūravas and the Soma-Based Ancestral Offering (अमावस्या-पितृतर्पण / सोमतर्पण-विधि)
अर्काग्नि मण्डले सोमे पर्वकालः कलासमः / एवं स शुक्लपक्षे वै रजन्यां पर्वसंधिषु
arkāgni maṇḍale some parvakālaḥ kalāsamaḥ / evaṃ sa śuklapakṣe vai rajanyāṃ parvasaṃdhiṣu
Within the sun’s fiery sphere, for Soma the parva-time is reckoned as equal to a single kalā; thus too, in the bright fortnight, it is so at night, at the junctions of the parvas.