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What had actually the reading of a clock to do with how fast light moves from A to B?Einstein says:
"We have not defined a common “time” for A and B, for the latter
cannot be defined at all unless we establish _by definition_
that the “time” required by light to travel from A to B equals
the “time” it requires to travel from B to A."
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And:
"In accordance with definition the two clocks synchronize if
tB(e2) - tA(e1) = tA(e3) - tB(e2)"
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tB(e2) - tA(e1) is the time the light uses to go from A to B
tA(e3) - tB(e2) is the time the light uses to go from B to A
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Einstein _defines_ that the clocks simultaneously show
the same (are synchronous in the stationary system)
if the time the light uses to go from A to B equals
the time the light uses to go from B to A.
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