By Isaac Asimov
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Amount of greatest To Star The apparent change in position of a fixed star during a year (aberraThis change is exaggerated in the figure and amounts to not more thaD Fig. 2. tion). about 20". 5. This explanation of aberration again contradicts the assumption that medium is decisive for the speed of light. For if this assumption were true, the light rays, upon entering our atmosphere, would be "swept" along, and no aberration would take place. the transmitting The absolute frame of reference. All these arguments suggested the ^independence of the electromagnetic laws from the motion of either the souTc^ofraaTation or the transmitting medium.
It is assumed that simultaneity as denned by this experiment is "transitive/' meaning that if two events A and B occur simultaneously (by our definition), and if the two events A and C It must also occur simultaneously, then B and C are simultaneous. to determine the simultaneity of be understood that this assumption is a hypothesis concerning the behavior of electromagnetic signals. Granted that this hypothesis is correct, we still have no assurance that our definition of simultaneity ence to which we is independent of the frame of refer our description of nature.
To measure the not at rest relatively to his frame of reference, finds the rate of the clocks in the other rate of a clock T which an observer compares is with it all the clocks in his system which That passes in the course of time. one *S*-clock with a succession of T an ^-observer compares ^-clocks, while an $*-observer comis to say, The pares one $-clock with several $*-clocks. £*-clock passes, in the course of time, ^-clocks which are farther and farther along the positive X-axis and therefore increasingly fast with respect to S*; consequently, the rate of the *S*-clock appears slow in comparison.
Life and energy by Isaac Asimov