What is the Book of Enoch and where did it come from? The precise publication date of the book is not known. However, it does appear to have been gained additions and interpolations. The only clue to is actual date is that we know that Enoch was the grandfather of Noah. And the Noah apparently mentions the book "And after that my grandfather Enoch gave me all the secrets in the book and in the parables which had been given to him, and he put them together for me in the words of the book of the parables." (The Book of Enoch chapter 68:1) So the Book appears to have been produced before but survived the Great Flood.

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The Chief Watcher:

Azazel - The making of swords, knives, shields and breastplates. All manner of working with metals and metalwork. This included the making of bracelets and ornaments. The secrets of precious stones, coloring and tinctures and antimony eye-cosmetics.

Watchers:

Araqiel - (AKA: Arakiel, Araqael, Araciel, Arqael, Sarquael, Arkiel and Arkas.) - The signs of the Earth .

Armaros - (AKA: Amaros) – Taught enchantments and sorcery.

Baraqijal - (AKA: Baraqel) - Taught astrology .

Ezequee - (AKA: Chazaqiel) – Taught the secrets of clouds and meteorology .

Kokabiel - (AKA: Kokabel, Kakabel, Kochbiel, Kokbiel, Kabaiel, and Kochab) – Taught the knowledge of constellations .

Penemue – The art of writing with ink and paper.

Sariel - (AKA: Samayaza, Saraqel, Suriel, Zerachiel, and Sarakiel).- The course of the Moon.

Semjaza - (AKA: Shemyazaz, Shamazya, Semiaza, Shemhazi, Semyaza and Amezyarak) - Taught the secrets of enchantments & root-cutting.

Shamsiel – Taught the signs of the Sun.

Other Watchers are also mentioned in the various texts:

The Leader - Samiazaz of:

Arakiba
Baraqijal
Danel
Ezeqeel
Kokabiel
Ramiel
Rameel

Chiefs of 10: - These are the Angelic Leaders who lead the 200 angels to choose human wives.

Ananel
Armaros
Asael
Batarel
Jomjael
Sariel
Samsapeel
Satariel
Turiel
Zaquiel

Note:
The Book of Enoch is any of several works that attribute themselves to Enoch,. The Book of Enoch refers usually to 1 Enoch, translated from the Ethiopic language by G.H Schodde (1882). Enoch 2 from Old Slavonic and translated by R. H. Charles (1896). And finally Enoch 3 currently only survives in Hebrew only and dates back to circa the 5th or 6th Century.

References:

See above note.