Darśapaurṇamāsa is a yajña (sacrifice) that is an important part of the Iṣṭi class of sacrifices. Darśa means “amāvasyā” (new moon) and paurṇamāsī means “full moon.” This sacrifice is performed during a two-day period — one associated with the new moon and the other with the full moon. It spans two days starting from the day of the full moon, and likewise, two days starting from the day of the new moon. This manuscript contains the 13 sections (khaṇḍas) of the first chapter (adhyāya) of the Āśvalāyana-śrautasūtra. It discusses the rituals performed during the Darśapaurṇamāsa. (Written in 7 lines per leaf.; 23 leaves foliated [i], 1–22, upper left and lower right verso.; Mistakes covered over in yellow or blacked out; some corrections and additions in margins; significant syllables, words, or phrases highlighted in red throughout; vertical margins marked with double red line.; European paper with watermarks.)