semi-major axis 长半轴 ; [天] 半长径 ; 长半径
major semi-axis of the earth [测] 地球长半径
major semi axis 长半轴
semi major axis 长半径 ; 半长同
semi-major axis of satellite orbit [航] 卫星轨道长半径
angular semi-major axis [天] 角半长径
Orbital semi major axis 轨道半长轴
semi-major axis modified 长半轴修正
The square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of 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。
Then, based on the generalized method, a modified method using adjusted semi major axis is presented.
提出了一种长半轴加修正的队形设计新方法。
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。
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