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I can agree that the orbit will be ever so lightly larger. My previous change in center of mass was wrong. It wouldn't be 6380km, it would be less than half that. Making a guestimate of an increase of 1300 km (for various reasons and ignoring the fact that this is way smaller than the difference between the earths semi-major axis and semi-minor axis AND the earths orbit isn't circular) I get an increase of about 30 min added to the standard earth year of 365 days.
I would be interested in how the change in the earths orbital eccentricty with change, considering is it continually changing anyway (over a 40000 year period that is)
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