Book of Enoch (1 Enoch) 74:2
And all these Uriel, the holy angel who is the leader of them all, showed to me, and their positions, and I wrote down their positions as he showed them to me, and I wrote down their months as they were, and the appearance of their lights till fifteen days were accomplished.
Background and history of Book of Enoch (1 Enoch), and issues with this book.
R. H. Charles, The Book of Enoch (London: SPCK, 1917), public domain. The verse text is the English Wikisource transcription of that translation. Charles’s editorial signs are kept. He rearranges some verses in chapters 5, 39, 90, 91, and 106, so those chapters are not a straight 1, 2, 3 sequence.