1 Enoch 74:11

ወይበጽሕ፡ ምብጻሒሆሙ፡ ለፀሓይ፡ ወለከዋክብት፡ ስሱ፡ መዋዕል፡ እምኀምስቱ፡ ዓመታት፡ በበ፡ ስሱ፡ ይበጽሖሙ፡ ሠላሳ፡ ዕለት፡ ወየሐጽጽ፡ ወርኅ፡ እምፀሓይ፡ ወእምከዋክብት፡ ሠላሳ፡ መዋዕለ።

And the overplus of the sun and of the stars amounts to six days: in 5 years 6 days every year come to 30 days: and the moon falls behind the sun and stars to the number of 30 days.