On Oct. 7, 2010, NASA's Solar Dynamics Observatory, or SDO, observed its first lunar transit when the new moon passed directly between the spacecraft (in its geosynchronous orbit) and the sun.
2010年10月7日，当一轮新月从太空飞船（与地球同步轨道）和太阳之间直接经过时，美国国家航空航天局太阳动力学观测台观测到了圆月的运转。
The main function of orbit calculation is to simulate the flight procedure of spacecraft, before that, the dynamics model of orbit must be established.
轨道计算主要用来模拟飞行器的飞行过程，前提是建立动力学模型。
The main function of orbit calculation is to simulate the flight procedure of spacecraft, before that, the dynamics model of orbit must be established.
轨道计算主要用来模拟飞行器的飞行过程，前提是建立动力学模型。
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