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。
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