Amāvasyā-Pitṛtarpaṇa: Purūravas and the Soma-Based Ancestral Offering (अमावस्या-पितृतर्पण / सोमतर्पण-विधि)
तिथीनां नामधेयानि विद्वद्भिः संज्ञितानि वै / दर्शयेतामथात्मानं सूर्याचन्द्रमसावुभौ
tithīnāṃ nāmadheyāni vidvadbhiḥ saṃjñitāni vai / darśayetāmathātmānaṃ sūryācandramasāvubhau
The names of the tithis have indeed been assigned by the learned. Then the Sun and the Moon—both—reveal their own nature.