Fun fact 12/11/2016

The Earth’s eccentricity is the shape of the Earth’s orbit around the Sun. This constantly fluctuating, orbital shape ranges between more and less elliptical (0 to 5% ellipticity) on a cycle of about 100,000 years.

http://www.indiana.edu/~geol105/images/gaia_chapter_4/milankovitch.htm

 

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