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The Earth and the Moon can be treated as a binary system. They orbit the Sun together in a period of 365.24 days (~ 1 year). In that period the Moon orbits the Earth some 13 times.

On diagrams the Earth's orbit is shown as a smooth ellipse. However, in reality that smooth ellipse is the mean track of the binary system of Earth & Moon. The Earth and its satellite , move in and out of this smooth elliptical curve, because of gravitational attraction and movement between the two.

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lenpollock

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1y ago

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