Some weird people out there consider this book to actually be from Enoch. This is of course nonsense. Scholars date the work to starting sometime around 100's BCE. It is apocryphal, written in the name of Enoch but not actually written BY him. There is a reason that although this text is found in the Qumran caves and must have been circulating among the Jews of that time period at least to some extent, it was not chosen by the sages to include in the canon of Biblical prophecy. Because it was not prophecy and not considered as such. So what it claims about this or that thing wouldn't be relevant to someone who accepts the canonization of what is and is not divine prophecy.