1 Enoch is not one book but five, written across roughly four centuries and preserved complete only in Ge'ez. This plan reads all 108 chapters in thirty sittings, in canonical order, with the context you need to know what you are looking at: who wrote each section, when, what it was arguing against, and where the New Testament and the Dead Sea Scrolls touch it.
1 Enoch begins the way Deuteronomy 33 and Numbers 24 begin — with an oracle from a man 'whose eyes were opened by God.' The opening theophany, in which God comes forth with ten thousand holy ones to judge the earth, is quoted almost verbatim in Jude 14–15, which is the single clearest evidence that this book was read as prophecy in the first-century church. Chapters 2–5 then turn to nature: the sun, the seasons, the trees keep their appointed order without deviation. The argument is moral, not scientific — creation obeys, and humanity does not. That contrast frames everything that follows.