1 Enoch 73:3

ወበኵሉ፡ ወርኅ፡ ሙፃኢሁ፡ ወሙባኢሁ፡ ይትዌለጥ፡ ወመዋዕሊሁ፡ ከመ፡ መዋዕለ፡ ፀሓይ፡ ወሶበ፡ ይዔሪ፡ ከዊነ፡ ብርሃኑ፡ ይከውን፡ ብርሃኑ፡ ሳብዐየ፡ እደ፡ እምብርሃነ፡ ፀሓይ።

And her rising and setting change every month: and her days are like the days of the sun, and when her light is uniform (i.e. full) it amounts to the seventh part of the light of the sun.