在天文动力学,架构在标准假说下的任何轨道都必须是圆锥切面的形状。圆锥切面的离心率,轨道的离心率,是定义轨道形状的重要参数,而且定义了绝对的形状。离心率可以解释为形状从圆形偏离了多少的程度。
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。
One characteristic of Earth's orbit is its eccentricity, the degree to which the orbit is an ellipse rather than a circle.
实际上,无论BX - 1还是神舟七号都处在几乎一样的绕地轨道上,只有离心率稍稍不同。
In reality, both the BX-1 and SH-7 module were in almost exactly the same orbit around the Earth, with a slight difference in eccentricity.
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