The periodic relative orbit was designed based on the relative orbit elements and the mission requirements.
采用相对轨道要素设计了理想的基准伴随轨道。
Use static elements or relative static elements in the changing graph to get the main moving point and its relations with other known conditions to correctly calculate the orbit equation.
利用变动图形吕的静止或相对静止因素，抓住主要动点及其与已知条件的联系，正确求出轨迹方程。
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