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A parabola has eccentricity 1, a hyperbola has eccentricity greater than 1.
If the eccentricity was 0 the ellipse would instead be a circle, and if the eccentricity was 1 it would be a straight line segment.
A : A circle is a closed figure with eccentricity 1. Similarly, ellipse is also a closed fig with eccentricity less than 1 and parabola with greater than 1.
The eccentricity of the Earth's orbit is currently about 0.0167; that rounds to zero.
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