From the Book of Enoch: Book of Noah:
"65. 1 And in those days, Noah saw the earth had tilted and that it's destruction was near."
There were also other observations that the laws of nature were suspended. The sun rose in the west and set in the east. The temperatures of the springs changed; rivers of fire flowed down through the valleys. Places on earth that were once cold, grew warm; and places that were usually warm became cold.
When the rains began to fall, the waters passed through hell before it fell to earth and hot rain scalded the sinners.
It was by the grace of god, not because of his merit, that Noah was allowed escape. He was better than others of his generation, but was not worthy of having wonders done for his sake.
The reason certain animals were deemed 'unclean' was because there were many creatures created by the fallen angels that were experiments of miscegenation. Not only did the human species cross lines with aliens (angels) but animals crossed genetic boundaries as well. This is believed to have come about due to these experimentations. Before the flood the number of genetically altered 'unclean' animals outnumbered the clean.
(Certainly makes one question the reasoning behind carrying any 'unclean' animals into the ark if this was the case!)
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Now that the earth has a slight tilt and a little wobble, I wonder how long it will be until we wake up to backwards day with the sun rising in the west?