Chapter 20 of the Book of Enoch
You mean the "so called" book of Enoch (1)? You mean that pseudopigraphical apocryphal work by an unknown heretic that contains numerous contradictions to scripture?
The absolute fascinating thing is that though the '1st book of Enoch' attributes this portion [chapter 60 [LX]] to 'Enoch', it is impossible to be so, by the very first line in the text, which reads,
"1. In the year five hundred, in the seventh month, on the fourteenth day of the month in the life of †Enoch†. In that Parable I saw how a mighty quaking made the heaven of heavens to quake, and the host of the Most High, and the angels, a thousand thousands and ten thousand times ten thousand, were disquieted with a great disquiet." [quoted from source, '1st book of Enoch chapter 60 [LX] verse 1', but actually is quoted and changed from the source the 'book of Noah'] -
http://www.sacred-texts.com/bib/boe/boe063.htm
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http://en.wikipedia.org/wiki/Book_of_Noah
How do we know? Well, what does the Scripture actually say regarding Enoch?
"And all the days of Enoch were three hundred sixty and five years:" [Genesis 5:23]
"And Enoch walked with God: and he [was] not; for God took him." [Genesis 5:24]
For example in 'chapter 65 [LXV]' 'Noah' summons 'Enoch' from Heaven, by crying out to him in [vs 2], 'Hear me, hear me, hear me'. This is ancestor worship, not the worship of God.
There are so many things in that 'source' that directly go counter to the word of God that to consider, 'canon' is extremely dangerous.
It also speaks of 'ten thousand years' [chapter 21 [XXI] verse 7; etc], but we know from the Bible that scripture teaches of the 7,000 year cycle.
If you think Jude cites from it, you'd be in error again, as both Jude and 'Enoch' are citing the OT already written long before either of them.
It is also very interesting to note that that 'source' is only considered valid in other apocryphal and pseudepigraphal works, which also have a great deal of material which goes directly counter to scripture, sorceries, astrologies, relic worship, worship and prayers to/of the dead, etc.
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http://en.wikipedia.org/wiki/Book_of_Enoch
Please try to at least stay in actual scripture (John 10:35), and post sensibly, instead of random screeds from some place on the web.