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Why can't two clocks synchronized with signals SLOWER than the speed of light, measure the speed of light in one direction?

I know that it is not possible to measure the speed of light in only one direction, and I understand why two clocks synchronized with light signals are useless. But I realize that I can't explain why two clocks synchronized with signals slower than light don't work either.

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  • $\begingroup$ What method of "slower than light" could we use? $\endgroup$ Nov 23 '20 at 22:12
  • $\begingroup$ Lets suppose that I am between the two clocks, at the same distance from each other, and I throw two baseballs at the same time, at the same speed, each one towards each clock, which triggers them. $\endgroup$
    – Pedro
    Nov 24 '20 at 6:19
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Because neither the speed of light, nor the speed of a turtle in one direction can be measured without arbitrary assumptions about the synchronism of clocks at the point of departure and point of arrival.

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  • $\begingroup$ Thanks Albert. That makes sense, of course ... I had not thought of it that way. I'm thinking that if instead of worrying about launching my signals at the same speed, I do it with the same kinetic energy, I'll have the same problem, right? $\endgroup$
    – Pedro
    Nov 24 '20 at 6:29

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