比较分析了两种捕获段水平面轨迹：切线轨迹和弧线轨迹。分别给出了两种轨迹的数学模型以及航程计算公式。
Two kind of horizontal plane trajectories of the Acquisition Phase (AP), Tangential Trajectory and Arc Trajectory, are discussed and predictors of ground track range are given, respectively.
如果我们将太阳在天空中的一年内运转轨迹描出，这将是另一个循环，这平面就是整个太阳系的黄道。
If we plot the position of the sun around the sky in a year, it will mark out a different circle in the sky which is the plane of the ecliptic of the solar system.
当我们把一个物体，放到引力场中，我们会得到在一个平面上的轨迹。
When we throw up an object in a gravitational field, you have the trajectory in a plane.
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