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。
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.
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。
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。
When their orbit eccentricity or inclination are near zero, some problems may occur when the GPS Kepler orbit elements fitting method is applied to fit their broadcast ephemeris parameters.
导航卫星一般采用近圆轨道，当卫星轨道偏心率或者轨道倾角接近于零时，利用GPS卫星开普勒轨道根数拟合卫星广播星历会出现一些问题。
In order to guarantee the characteristics of frozen orbit, in-plane orbit control needs to adjust the semi-major axis, eccentricity, argument of perigee simultaneously.
为了保证冻结轨道的冻结特性，平面内轨道控制需要对半长轴、偏心率和近地点幅角都控制。
Please find the minimum possible value of the eccentricity of the asteroid's orbit.
请算出该小行星轨道可能的最小偏心率的值。
Please disregard the eccentricity of the Earth's orbit, self motions of the stars and all atmospheric effects.
可忽视地球轨道的偏心率，自转，恒星自行和大气折射。
Please disregard the eccentricity of the Earth's orbit, self motions of the stars and all atmospheric effects.
可忽视地球轨道的偏心率，自转，恒星自行和大气折射。
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