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of the Moon's orbit. To distinguish between them:
* A circumlunar free-return trajectory around the Moon. The spacecraft passes behind the Moon. It moves there in a direction opposite to that of the Moon, or at least slower than the Moon in the same direction. If the craft's orbit begins in a normal (west to east) direction near Earth, then it makes a sort of figure 8 around the Earth and Moon when plotted in a coordinate system that rotates as the Moon goes around the Earth. (But the "figure

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