If... it be supposed that another way of measuring time is adopted... enunciation of the law would be... translated into another language... much les… - Henri Poincaré

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If... it be supposed that another way of measuring time is adopted... enunciation of the law would be... translated into another language... much less simple. So that the definition implicitly adopted by the astronomers may be summed up..: Time should be so defined that the equations of mechanics may be as simple as possible... [i.e.,] there is not one way of measuring time more true... only more convenient.