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"We find, among the ancients, many traces of their acquaintance with the period of 600 years.." (See #4)

"We find, among the ancients, many traces of their acquaintance with the period of 600 years, or what is termed the great year, when the solar and lunar phenomena recur precisely at the same points. Cassini and Bailly have shown that there is an actual foundation for this opinion."
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12 Steps Graphic

Each bullet point cites its source.
The infographic is intended show evidence for the recognition of a 600 year cycle
and how the ending of one of those periods coincided with the 'Great Flood'.
12 steps 600yr flood