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- ...ctions each with one of their foci being coincident at the center of mass (barycenter).8 KB (1,337 words) - 00:07, 13 December 2020
- The [[Moon]] revolves with the Earth around a common [[barycenter]] every 27.32 days relative to the background stars. When combined wit54 KB (8,201 words) - 00:29, 13 December 2020