[reed13k]

So it was a 40,000 year cycle till 1M years ago when the cycles got longer.

Either the Sun changed it’s behavior or the Earth’s orientation changed very slightly.

I’m going to hypothesize (that’s scientific for guessing based on an idea) since it was so abrupt that the Earth got it’s noggin’ popped by a fairly large something or other just enough to change the cycle.

[PIF]

Earth got it’s noggin’ popped by a fairly large something or other just enough to change the cycle.

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The the “something” would have to be bigger than 60 km since that didn’t change the climate 60 mya.