The book consists of five quite distinct major sections (see each section for details):
- The Book of the Watchers (1 Enoch 1 – 36)
- The Book of Parables of Enoch (1 Enoch 37 – 71) (Also called the Similitudes of Enoch)
- The Astronomical Book (1 Enoch 72 – 82) (Also called the Book of the Heavenly Luminaries or Book of Luminaries. )
- The Book of Dream Visions (1 Enoch 83 – 90) (Also called the Book of Dreams)
- The Epistle of Enoch (1 Enoch 91 – 108)