Ok, shoot. I'd love to hear how it's not an eccentric circle...
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Most of us have answered this question correctly in various ways.
It's the question itself that makes the desired answer elusive.
Google Sez!!! (In honor of Richard Dawson)
The shape of Earth's orbit can be nearly circular to slightly elongate and back again. The time it takes to go through a complete cycle from circular to elongate and back to circular is about 100,000 years.
Oh Crap, I think I just stepped in to the prelude to another Global Warming thread :wall:
He's actually thinking bigger.