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Failed to connect to MySQL: (1203) User howardkn already has more than 'max_user_connections' active connectionsPath: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: Mikko Newsgroups: sci.physics.relativity Subject: Re: Sync two clocks Date: Fri, 23 Aug 2024 15:21:01 +0300 Organization: - Lines: 38 Message-ID: References: <66c6fe9d$0$3360$426a74cc@news.free.fr> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Injection-Date: Fri, 23 Aug 2024 14:21:02 +0200 (CEST) Injection-Info: dont-email.me; posting-host="bfc65ec5aa48ce91b41c9d094026f89c"; logging-data="969612"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX185ygTcAoys/n/2Uy8v5KhH" User-Agent: Unison/2.2 Cancel-Lock: sha1:d8z2v9oXELuzvgS3TC8bH8kjbxs= Bytes: 2939 On 2024-08-23 11:45:50 +0000, Richard Hachel said: > Le 23/08/2024 à 13:23, "Paul.B.Andersen" a écrit : >> >> https://paulba.no/paper/Electrodynamics.pdf >> Quote from § 1. Definition of Simultaneity: >> ------------------------------------------- >> "If at the point A of space there is a clock, an observer at >> A can determine the time values of events in the immediate >> proximity of A by finding the positions of the hands which >> are simultaneous with these events. >> If there is at the point B of space another clock in all >> respects resembling the one at A, it is possible for an observer >> at B to determine the time values of events in the immediate >> neighbourhood of B. >> But it is not possible without further assumption to compare, >> in respect of time, an event at A with an event at B. >> We have so far defined only an “A time” and a “B time.” >> We have not defined a common “time” for A and B, for >> the latter cannot be defined at all unless we establish >> by definition that the “time” required by light to travel >> from A to B equals the “time” it requires to travel from B to A. >> " >> >> If you can read, you will see that Einstein did say what I said. > > Here is finally a solid basis. > And that is very well said. > The small drawback that remains is that Einstein proposes a definition, > but without explaining which observer will be able to consider the > proposition as true. What is not explained in the quoted text is explained later in the same article. -- Mikko