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Path: ...!news.misty.com!2.eu.feeder.erje.net!feeder.erje.net!proxad.net!feeder1-2.proxad.net!usenet-fr.net!pasdenom.info!from-devjntp Message-ID: <DXGSZoOy8NKrDPHyCw-4Caf7a64@jntp> JNTP-Route: news2.nemoweb.net JNTP-DataType: Article Subject: Re: "Time" vs "physical time" References: <17e914f508c7a9cf$96455$546728$c2565adb@news.newsdemon.com> <dwvnP-SoKZPwHpz6HgPhxwtG7e4@jntp> <v92ugo$4cam$1@dont-email.me> <XhF-ilyxW2WRkQK5uYxoOVgm1rU@jntp> <v98g6k$srl7$1@dont-email.me> Newsgroups: sci.physics.relativity JNTP-HashClient: rQnM52gdUfCTq2vpvq4ofXh8abw JNTP-ThreadID: 17e914f508c7a9cf$96455$546728$c2565adb@news.newsdemon.com JNTP-Uri: http://news2.nemoweb.net/?DataID=DXGSZoOy8NKrDPHyCw-4Caf7a64@jntp User-Agent: Nemo/0.999a JNTP-OriginServer: news2.nemoweb.net Date: Sat, 10 Aug 24 21:35:46 +0000 Organization: Nemoweb JNTP-Browser: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/127.0.0.0 Safari/537.36 Injection-Info: news2.nemoweb.net; posting-host="e8cbf2474b472b9bb79db3dccb6a856bc1d05409"; logging-data="2024-08-10T21:35:46Z/8982331"; posting-account="4@news2.nemoweb.net"; mail-complaints-to="julien.arlandis@gmail.com" JNTP-ProtocolVersion: 0.21.1 JNTP-Server: PhpNemoServer/0.94.5 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-JNTP-JsonNewsGateway: 0.96 From: Richard Hachel <r.hachel@jesauspu.fr> Bytes: 2511 Lines: 32 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.