Schema des Michelson-VersuchsWhile the swimmer gets from A to B, he drifts just as his starting point, let us say by AA*. Der other swimmer tries to reach the mark D*, which has drifted to the position C when he arrives. He returns by swimming to the mark E, which has drifted to A = E* when he arrives. Now, the first swimmer has reached the position B only, and he has yet to return. (The speed of the swimmer corresponds to that of light c, the streaming velocity - here 0.6 c - to that of the earth). The difference in time (here clearly visible) is in the case of the Potsdam Michelson experiment mere 0.3 10-16 sec, equivalent to 10 nm difference in path.
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