Explain the difference in the earths climate change when the earths orbit changes from elliptical to circular?

Explain the difference in the earths climate change when the earths orbit changes from elliptical to circular?
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Earth's eccentricity Eccentricity is defined as the difference in shape between an ellipse and a perfect circle. In a similar fashion to Earth's obliquity, the more uniform Earth's orbit is (more like a perfect circle), the less difference there is in climate change throughout the year.
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