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Earth/Moon system #2 HTML5

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Summary

The center of mass of the Earth/Moon system is the only point which follows the circular (elliptical !) path around the sun. Notice that for a static distant observer, the moon seems to periodically go backward in its orbit, an example of retrograde motion.

Click on to stop the movie.

Learning goals

  • To illustrate the motion of the center of mass of the Earth / Moon system.

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