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Subject: Re: "Time" vs "physical time"
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Date: Sat, 10 Aug 24 21:35:46 +0000
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From:  Richard Hachel   <r.hachel@jesauspu.fr>
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Le 10/08/2024 à 21:48, "Paul.B.Andersen" a écrit :
> Den 08.08.2024 19:55, skrev Richard Hachel:

> OK, let's assume that the length of the tunnel is exactly 1320 km.
> We are using two clocks showing UTC+2h. But they have to be
> more precisely synchronised than the clocks on the airports
> which can not be expected to be synchronous to much better than
> within a second.
> 
> So we will us two atomic clocks which are synchronised
> by GPS to show UTC+2h to within 1 ns.
> 
> The particle we will use is a photon.
> 
> A photon is sent from Oslo at the time 12.00.000000000 ± 1ns
> and is detected in Paris at the time   12.00.004403046 ± 1ns
> The measured speed of the photon is 299792461 ± 68 m/s
> 
> A photon is sent from Paris at the time 13.00.000000000 ± 1ns
> and is detected in Oslo at the time     13.00.004403046 ± 1ns
> The measured speed of the photon is 299792461 ± 68 m/s
> 
> Any problem with this?

 No.

 Absolutely not.

 All you said is correct.

 R.H.