The Earth's elliptical orbit around the sun (eccentricity) is mostly constant, only changing negligibly over a 100,000 year period.

Name: The Earth's elliptical orbit around the sun (eccentricity) is mostly constant, only changing negligibly over a 100,000 year period.
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The Earth's eccentricity actually oscillates between more and less elliptical over a 100,000 year period, with a cycle length of approximately 100,000 years.

The Earth's Elliptical Orbit Around the Sun (Eccentricity) Is Mostly