On the basis of the method of action-angle variables the conditions of closed orbits under the action of general power-type gravitation potential are discussed on this paper.
本文采用作用角变量的方法，讨论了闭合轨道在一般幂次型引力势作用下的情况。
The purpose of this paper is to give an analytical expression of a tri axes ellipsoid body's gravitation potential with layered, focus tri axes ellipsoidal density distribution.
利用拉梅谐和函数理论，证明了共焦椭球成层分布三轴椭球体的外部引力位与均质三轴椭球体的外部引力位具有一致的形式。
The purpose of this paper is to give an analytical expression of a tri axes ellipsoid body's gravitation potential with layered, focus tri axes ellipsoidal density distribution.
利用拉梅谐和函数理论，证明了共焦椭球成层分布三轴椭球体的外部引力位与均质三轴椭球体的外部引力位具有一致的形式。
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