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Physics

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    $\begingroup$ Equations are "physics logic". Don't discriminate against formulae! $\endgroup$ Commented Apr 7, 2015 at 13:16
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    $\begingroup$ Note that, although the sun is often depicted as stationary, it is not! Perhaps your understanding will get better if you consider two equal masses rotating around each other in an elliptical orbit. $\endgroup$ Commented Apr 7, 2015 at 13:34