Re: Sync two clocks

Am Donnerstag000022, 22.08.2024 um 13:11 schrieb Python:
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Richard, read your watch NOW. Write down the time nn:nn:nn.
The time nn:nn:nn is a proper time (read off a clock), it is
invariant, not depending on frame of reference.
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Nobody can have another opinion of what time YOU read of YOUR watch.
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How is it possible to fail to understand this?
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If we have two stationary clocks in an inertial frame,
  and clock A shows tA = t1 when it emits light,
  and clock B shows tB = t1 + td when the light hits it,
  and clock A shows tA'= t1 + 2⋅td when it is hit by the reflected light,
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then tA, tB, tA', t1 and td are all proper times which are frame
independent (invariants) and "the same for all".
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  tB − tA = t'A − tB = td
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The transit time td is a frame independent invariant and
the same in both directions, which means that the clocks according
to Einstein's _definition_ are synchronous in the inertial frame.

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You introduced t_d or 'transit time' (aka 'delay'), while Einstein didn't use any of these terms.

 But he write down two equations that implies directly that a delay
is taken into account.

The equation on page 3 COULD be interpeted as calculation of the delay.
But Einstein wrote, that would be the definition of the speed of light.
I would miss the word 'delay' in this context (or something similar).
Also the remainder of this paper does not mention delay neither.
So: where have YOU found any use of delay or transit time in this paper?
I 'combed' the text very carefully and could not find any statement, which eventually would match this discription.
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TH