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From CreationWiki, the encyclopedia of creation science

The eccentricity of any circle, ellipse, parabola, or hyperbola is a dimensionless number that describes the deviation of the path described from a perfect circle.

For a circle, eccentricity e = 0.

For an ellipse, 0 < e < 1.

For a parabola, e = 1.

For a hyperbola, e > 1.

In orbital mechanics, e = (apoapsis - periapsis) / (apoapsis + periapsis)

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