[blam]

"A 1000 year cycle wouldn't surprise me either,and in fact,I'd be more surprised to find out that one didn't exist,than to find out that one did."

Yup. I like your thinking.

[StopGlobalWhining]

A good link explaining Milankovich's theory is at the University of Montana: http://www.homepage.montana.edu/~geol445/hyperglac/time1/milankov.htm.

I'd post it here, but the graphics total about 70K, and I don't want to bog down the thread.