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。
Changes in the eccentricity of Earth's orbit occur in a cycle of about 96,000 years.
地球轨道偏心率的变化大约在96000年的一个周期内发生。
This method has following advantages: (1)The method is useful for satellite orbit of any eccentricity.
本方法具有以下优点： （1）本方法适用于任意偏心率的卫星轨道。
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