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Animated graph showing the position of the Moon around Earth. The position of the Moon is on the y-axis, and time in days is along the x-axis. The Moon completes a full orbit around the Earth in 27.32 days, with respect to the distant background stars. However, as the Earth moves around the Sun in this time, the Moon's position relative to both the Earth and the Sun is not the same after this orbit, and so it does not have the same phase. See clip K006 7162 for a graph of the phases, and K006 7161 for the two graphs combined.
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