DAY 11 of the nuntarriyašḫa- festival was devoted to celebrations of the Sun-goddess of the Earth. Although the description of this day is either missing from or poorly preserved in the outline tablets, its principal event is attested in the colophon of the only surviving day-tablet, KBo 22.177. While the text does not explicitly mention the nuntarriyašḫa- festival, it provides instructions for the celebrations of two consecutive days of an autumn festival – one dedicated to Ziparwa, and the other to the Sun-goddess of the Earth. This sequence is in line with the preserved passages in the outline tablets, and, moreover, closely parallels corresponding events known from the spring AN.DAḪ.ŠUM festival. On this basis, the attribution of KBo 22.177 to the nuntarriyašḫa- festival can be regarded as secure.

The identification of DAY 11 as a day devoted to the Sun-goddess of the Earth, along with the corresponding restorations in the surviving outline tablets, goes back to Houwink ten Cate Ph.H.J. 1988a: 184f. (with n. 35), who also noted the parallelism with the AN.DAḪ.ŠUM festival. An updated overview of the events of DAY 11 is provided by Nakamura M. 2002a: 101f.