Comments by "Cestarian Inhabitant" (@cestarianinhabitant5898) on "Veritasium"
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If the problem is the synchronization of the 2 clocks, it's not that difficult of a problem.
You need a third device.
2 clocks
1 device that sets and synchronizes the clock.
Just think of it like this.
The 'synchronizer' is position in the middle between the two clocks, it sends out a pulse to both clocks at the same time, the clocks then after a little time send a signal back, and the synchronizer compares the signals and if they match, the clocks are synchronized, if they don't match, the clocks are desynchronized.
The problem in the end though, is that this experiment can't truly be executed with perfect precision, because perfect precision does not exist. Even if you manage to perfectly position the synchronizer between the two clocks, one side's wire might still be just a few millimiters longer than the other; which is enough to cause a delay in the signal ruining the accuracy of the synchronization.
There's also the problem that you cannot verify that the clocks are exactly identical down to the atomic level, due to the precision we are aiming to achieve, since the speed at which light travels is no damn joke after all, this would be necessary. Even if all parameters are perfected, the clocks are identical, the connectors between them and the synchronizer as well are identical, there would still be a margin of error because we simply do not know everything.
But there's another way we can measure the one way speed of light.
With more precision, instead of measuring how fast light travels over 1km, you could just measure how fast it travels over a few meters or centimeters using only one clock that's started and stopped by the light.
However, ultimately, if we want to assume that the speed of light is constant, we need to measure how fast it travels in all directions, and in different environments (air, liquid, vaccum...), and over different distances (1 meter, 1km, 100km, etc) in order to truly confirm it, and we need to do this with outrageous levels of precision for it to hold any weight.
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