Quote:
Originally Posted by StevenCrum
Einstein's statement about synch being accomplished in both the stationary and the moving rod systems, wasn't that at all, and instead the moving rod situation where the "stationary" system observers there are seeing the clocks from the ground looking at the rod moive past them. The rod observers were on the rod and looking at the clocks from there.
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This might be the source of confusion. The stationary observers are
not looking at the clocks on the moving rod. The have their own, 'stationary' clocks that they are using to measure the length of the rod.
Quote:
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Originally Posted by albert
By means of stationary clocks set up in the stationary system and synchronizing in accordance with § 1, the observer ascertains at what points of the stationary system the two ends of the rod to be measured are located at a definite time. |
The two
sets of clocks are synchronised in advance...
Quote:
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Originally Posted by albert
We imagine further that at the two ends A and B of the rod, clocks are placed which synchronize with the clocks of the stationary system...
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(My emphasis throughout)
...but when the time taken for the light to travel from Clock A to Clock B (and back) is measured in the moving frame of reference, the synchronicity is lost - so the
sets of clocks are no longer synchronised.