Path: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: Python Newsgroups: sci.physics.relativity Subject: Re: Sync two clocks Date: Tue, 20 Aug 2024 16:03:21 +0200 Organization: CCCP Lines: 40 Message-ID: References: <17ed74a0f203a43c$401861$558427$c2065a8b@news.newsdemon.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Injection-Date: Tue, 20 Aug 2024 16:03:22 +0200 (CEST) Injection-Info: dont-email.me; posting-host="e7766270ddb83778ad61a74e624af08e"; logging-data="3540044"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1/mVqWQQ76sHtDLSo23Y+SV" User-Agent: Mozilla Thunderbird Cancel-Lock: sha1:gs7XRFSoaXshIL38DgsT/Wb2ZG8= In-Reply-To: <17ed74a0f203a43c$401861$558427$c2065a8b@news.newsdemon.com> Content-Language: en-US Bytes: 2926 Le 20/08/2024 à 16:01, Maciej Wozniak a écrit : > W dniu 20.08.2024 o 15:08, Paul.B.Andersen pisze: >> Den 20.08.2024 01:15, skrev Richard Hachel: >>> It is impossible to synchronize two watches A and B located in >>> different places. >>> It is not a technical problem, it is not a problem of intelligence, >>> it is simply that it is as impossible as finding a round square, or a >>> natural number between 5 and 6. >>> Because nature is not made like that. >>> Anyone who wants to synchronize watches with each other does not >>> realize that he is looking for rabbit horns. >> >> -------------------- >> >>> The only thing we can do is to find a kind of abstract, imaginary >>> synchronization procedure, called the Einstein procedure where tAB is >>> supposed to be equal to tBA not only for the point M which is the >>> only real origin of the synchronization, but for everyone. >> >> So the only thing we can do is to do what Einstein did, >> namely to define a synchronisation procedure which >> makes it possible to synchronise two clocks at different >> places in an inertial frame of reference. > > That's for sure the only thing [you] > can do. Professionals of GPS could do more. > Sure ! Thanks to GR. As Paul wrote in another post : >> Note that clocks showing UTC are synchronous in the non-rotating >> Earth centred frame of reference (ECI-frame), but they are NOT >> synchronous in the ground frame. >> Note the rather peculiar phenomenon that the UTC clocks >> are synchronous in the frame were they are moving, but >> not synchronous in the frame where they are stationary. BTW. You are posting here because you love to be spanked, aren't you?