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One characteristic of Earth's orbit is its eccentricity, the degree to which the orbit is an ellipse rather than a circle.
地球轨道的一个特点是它的离心率,也就是轨道是椭圆而不是圆形的程度。
Where a perfect circle has an eccentricity value of zero, roughly half of exoplanets seen thus far have an eccentricity of 0.25 or greater.
一般一个完美圆周的偏心值为0,而约有一半的系外行星的偏心值在0.25或者更高。
Drag to add a circle defined by radius. Adjustable eccentricity allows for ellipse.
拖动此形状,可添加一个由半径定义的圆。椭圆中允许调整离心率。
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