Quote: the propagation of light assigns equal tracts to equal time intervals

Quotation Skeleton

[For example,] The phenomenon of the propagation of light … local time, and conversely. … if two ideal clocks are going at the … other), [p. 238] they will always go at the … place. If this law were not valid for … be in such exact agreement as experience demonstrates. … of practical geometry. This, in the last analysis, … space-time continuum.   Google-1   Google-2

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Additional Titles

Quote: if ideal clocks go at the same rate, they always go at the same rate; e.g., sharp spectral lines from atoms of the same chemical element; a foundation of 4-d space-time

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