, Volume 8, Issue 7, pp 515-524

A test theory of special relativity: II. First order tests

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First-order tests of special relativity are based on a comparison of clocks synchronized with the help of slow clock transport with those synchronized by the Einstein procedure. This comparison enables the measurement of the one-way velocity of light and is equivalent to a measurement of the time dilatation factor. The accuracy of present measurements is of the order 10−7, yielding an upper limit of 3 cm/sec for the ether drift.