Jammer then comments that Einstein seemed to regard this assumption as a definition of
clock synchronization or simultaneity, and he continues, ‘‘If indeed this assumption was
meant to serve as a definition it may be criticized as involving a circularity because of its
use of the concept of the one-way velocity of light, the determination of which requires two
spatially separated synchronized clocks.’’ It seems to me that Jammer misreads Einstein
here. My reading of Einstein is that he was supposing, however the clocks are set, we look
at the ratior/(tB–tA). Then if we manipulate the clock settings so that, whatever points we
choose for AandB, all of these ratios will equal c, the totality of the clocks will be
synchronized and their readings will give us ‘‘time’’. This is not an operational definition of
clock synchronization, but it also is not a circular one.
Jammer then comments that Einstein seemed to regard this assumption as a definition ofclock synchronization or simultaneity, and he continues, ‘‘If indeed this assumption wasmeant to serve as a definition it may be criticized as involving a circularity because of itsuse of the concept of the one-way velocity of light, the determination of which requires twospatially separated synchronized clocks.’’ It seems to me that Jammer misreads Einsteinhere. My reading of Einstein is that he was supposing, however the clocks are set, we lookat the ratior/(tB–tA). Then if we manipulate the clock settings so that, whatever points wechoose for AandB, all of these ratios will equal c, the totality of the clocks will besynchronized and their readings will give us ‘‘time’’. This is not an operational definition ofclock synchronization, but it also is not a circular one.
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