posted on Apr, 27 2010 @ 04:59 PM
Looking at the major peaks and valleys:
The average time span between the lows is 81,500 years, with a range of 33,000 to 125,000.
The average time span between the highs is 92,500, with a range of 67,000 to 125,000 years.
The time span between the peaks and valleys varies quite a lot as well.
Cycles, yes. Regular, not so much.
Your observation has been made before though. It is thought that the cycles are influenced by the Earth's various motions. Based on combination of
the Earth's orbital parameters and precession it's been calculated that we've got about 50,000 years to go in this warm period.
[edit on 4/27/2010 by Phage]