The shape of Earth's orbit varies over time which can change weather patterns on earth significantly especially in the polar regions

 The shape of Earth's orbit changes over time. I believe the cycle is around 400,000 years as the Orbit goes from more elliptical to more circular and back again

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The Earth's orbit is elliptical, meaning it's a slightly oval-shaped path rather than a perfect circle. This elliptical shape means the distance between the Earth and the Sun varies throughout the year, with one point in the orbit being the closest (perihelion) and another being the farthest (aphelion). The orbit's eccentricity, or how much it deviates from a perfect circle, is small, making the orbit appear almost circular. 

Key Characteristics of Earth's Elliptical Orbit:

• Sun at a Focus:

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The Sun is not at the center of the ellipse but rather at one of its two foci. 

The Earth is closest to the Sun (perihelion) in early January and farthest away (aphelion) in early July. 

The shape of the orbit changes over long periods due to the gravitational influence of other planets, particularly Jupiter and Saturn. This is part of the Milankovitch cycles. 

Although elliptical, Earth's orbit is very close to a perfect circle, which is why it's often mistakenly depicted as a circle. 

A measure of how much an orbit deviates from a perfect circle. Earth's orbital eccentricity is currently 0.0167. 

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  The Conversation

  
  

Varying Distance:

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Slowly Changing Shape:

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Near-Circular Orbit:

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Eccentricity:

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