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Path: ...!weretis.net!feeder9.news.weretis.net!i2pn.org!i2pn2.org!.POSTED!not-for-mail From: hitlong@yahoo.com (gharnagel) Newsgroups: sci.physics.relativity Subject: Re: Space-time interval (2) Date: Thu, 15 Aug 2024 13:02:32 +0000 Organization: novaBBS Message-ID: <8aa8f6f12763b2c385bf53546a09dbcc@www.novabbs.com> References: <YqTjbAPdSf8P-veYFHQCI8eskLU@jntp> <v9g6ij$3vsfg$1@dont-email.me> <AVa827R_LOez7mc5Ad3CT6GyhiA@jntp> <327c4ebc77dc16239ac38f00b508451b@www.novabbs.com> <ZmtVAt4HhKe0jdT-a3px1duKdmw@jntp> <v9i8c5$bvnu$9@dont-email.me> <VOohu46_lYfs6YEQG8qZQKYepNw@jntp> <v9ia7k$bvnu$11@dont-email.me> <FxxcAtB-BaU4TzfE-6Txlbo_gEA@jntp> <v9kiq7$tput$1@dont-email.me> <EtDoDs0BPVkZJTF9Hcr7blKk9p0@jntp> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Injection-Info: i2pn2.org; logging-data="2665393"; mail-complaints-to="usenet@i2pn2.org"; posting-account="p+/k+WRPC4XqxRx3JUZcWF5fRnK/u/hzv6aL21GRPZM"; User-Agent: Rocksolid Light X-Rslight-Site: $2y$10$YA.3EeWKR0SbxfwhnLWpPu92qZ1TYxIBznT/pKDJUub.ar.aDDRti X-Rslight-Posting-User: 47dad9ee83da8658a9a980eb24d2d25075d9b155 X-Spam-Checker-Version: SpamAssassin 4.0.0 Bytes: 4591 Lines: 77 On Thu, 15 Aug 2024 12:10:55 +0000, Richard Hachel wrote: > > But now that we have a synchronization based on M and validated > for M, we can make A and B beep simultaneously, and M will always > receive the beeps simultaneously. This is the universal present > for M. But ONLY for M. Breathe, blow, yourself, Richard. > If I place myself at A, A will look at B with astonishment, and > will say B is out of tune, the present moment with which he beeps, > reaches me late, or rather EXISTS for me late. He beeps in my > future, and not at my present moment, because when I beep, his > beep does not exist FOR me, it will only exist in t=AB/c. Breathe, blow, Richard. Scientists and engineers are smarter than you, Richard. They can use their brains. They have used Einstein synchronization, so they know the distance between A and B. They can use a quaint method called mathematics to calculate when the signal from B was launched. > This is what we call universal anisochrony. It's simply time-of-flight delay. This isn't something that requires a new moniker or to go in a tizzy about. Your countryman, Poincare understood it, so did Einstein, and much better than you. > Are you finally starting to understand? We have always understood it. We also have brains that understand that it is a trivial matter. > .... > And so on for all the watches of the universe. You always seem to want to go to extremes. No one wants to synchronize all the watches in the universe. > The solution is therefore to create a universal abstract time, and to > agree on this point, ideally placed at the same universal distance from > all the world capitals (and even that of the moon), this is what we call > universal time. > > It is this time that is used today, and which "simulates" a global > present time which, by nature, does not exist, and has never existed > in the whole universe. But ... it doesn't defeat the "problem" you imagined: if city A sends a signal at time T to city B, it will not arrive at time T. > The speed of light is not a photon moving at speed c in a universal > present moment. It is for the observer an instantaneous transaction FOR > HIM in his own present moment, the two events (the supernova bursts, I > see the supernova bursting) being part of his own present. > > What we consider a universal present is a useful abstract work. But > abstract. It does not exist. > > Like the ancient notion of a flat earth. > > R.H. Richard, you're worrying too much. Breath, blow. Everyone understands this, they just can't understand why you're freaking out about it. Look, people have understood the concept for centuries. If a runner brought message to the government of an event from City A and another runner brought a message to the government from City B that was related to the event in City A, the potentate could consider the runners' speeds and determine whether the events happened at the same time. Sherlock Holmes could do this. Henri Poirot could do it. The medium doesn't matter. https://health.clevelandclinic.org/how-to-stop-overthinking "Overthinking is an unhealthy habit that typically causes more stress by focusing on the negative, dwelling on the PAST and worrying about the FUTURE." [Emphasis added]