simultaneity

………. and a bag of $latex \text{ c }$s

We thus require…

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We thus require a definition of simultaneity such that this definition supplies us with the method by means of which, in the present case, he can decide by experiment whether or not both the lightning strokes occurred simultaneously.

As long as this requirement is not satisfied, I allow myself to be deceived as a physicist (and of course the same applies if I am not a physicist), when I imagine that I am able to attach a meaning to the statement of simultaneity.

(I would ask the reader not to proceed farther until he is fully convinced on this point.)

— A. Einstein

( Translation of the German original retrieved from

http://en.wikisource.org/wiki/Relativity:_The_Special_and_General_Theory/Part_I#Section_8_-_On_the_Idea_of_Time_in_Physics )

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