The square of the orbital period of a planet is directly proportional to the cube of the semi-majoraxisof its orbit.
第三定律（周期定律）：各个行星绕太阳公转周期的平方和它们的椭圆轨道的半长轴的立方成正比。
2
In order to guarantee the characteristics of frozen orbit, in-plane orbit control needs to adjust the semi-majoraxis, eccentricity, argument of perigee simultaneously.