行星的摄动使得地球绕太阳的轨道是不规则的。
Planetary perturbations make the earth's orbit about the sun irregular.
小卫星在实际运行中受到多种摄动力的作用，这会对其轨道造成不同程度的影响，因此在小卫星的轨道设计与控制中，摄动是必须考虑的重要因素。
Micro satellite is under the influence of perturbative forces which would affect its orbit, so it is important to consider these perturbations in micro satellite orbit design and control.
计算给出了一日内的卫星轨道，反映了在地球非球形摄动下轨道的变化情况，且对轨道面的进动进行了计算。
The orbit variation in one day under the nonspherical perturbation is shown and the motion of the orbit plane is computed.
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