Groups > sci.physics.relativity > #666426

Re: Universal anisochronism

From	Thomas Heger <ttt_heg@web.de>
Newsgroups	sci.physics.relativity
Subject	Re: Universal anisochronism
Date	2025-10-02 08:46 +0200
Message-ID	<mk6l63F68rgU2@mid.individual.net> (permalink)
References	<b7GfLGeT6J4bGflGjf12RMdqpAQ@jntp>

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Am Sonntag000028, 28.09.2025 um 13:19 schrieb Richard Hachel:
> The problem of synchronization.
> Is it possible to synchronize multiple clocks located in different 
> positions within an inertial frame of reference?
> In Newtonian physics, yes, because space and time are considered 
> independent entities.
> In relativistic physics, this is no longer possible, since each clock 
> has its own concept of universal simultaneity, specific to its own frame 
> of reference.
> Let's send a signal from point M, the midpoint of AB, to points A and B. 
> It is clear that for M, regardless of the time at which it assumes the 
> signal was received by the two other points, the two events tA and tB 
> would have been simultaneous. M doesn't know "when" they occurred, but 
> it knows "that they were, by definition, simultaneous FOR IT, since the 
> distances MA and MB are equal."
> However, in relativistic physics, for observer A, the two events are not 
> simultaneous, nor are they for observer B. For A, event tB occurs in the 
> future of tA. And conversely, for B, event tA occurs in the future of tB.
> In short, the concept of a universal, absolute present, the foundation 
> of Newtonian physics, does not exist.
> This is the concept of universal anisochronism, and this is the 
> fundamental principle of the theory of relativity.
> R.H.


You need to distinguish between simultaneity and apparent simultaneity.

This is necessary, because light (or any other signal with e.g. radio 
waves) has finite velocity and that will cause some degree of delay.

But that delay is caused by the finite speed of light and not because 
the remote clock is late.

This would force us to correct the received signal by that delay, 
because otherwise we would ascribe to the remote clock, what the remote 
clock does not say.

This could be done if we separate simultaneity from the impression and 
add the delay 'by hand'.


TH

Thread

Universal anisochronism Richard Hachel <rh@tiscali.fr> - 2025-09-28 11:19 +0000
  Re: Universal anisochronism Harold Babosov <sava@ob.ru> - 2025-09-28 12:56 +0000
    Re: Universal anisochronism Richard Hachel <rh@tiscali.fr> - 2025-09-28 13:12 +0000
      Re: Universal anisochronism The Starmaker <starmaker@ix.netcom.com> - 2025-09-28 16:36 -0700
        Re: Universal anisochronism "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2025-09-28 17:14 -0700
  Re: Universal anisochronism The Starmaker <starmaker@ix.netcom.com> - 2025-09-28 10:23 -0700
    Re: Universal anisochronism The Starmaker <starmaker@ix.netcom.com> - 2025-09-28 10:32 -0700
      Re: Universal anisochronism The Starmaker <starmaker@ix.netcom.com> - 2025-09-29 16:11 -0700
        Re: Universal anisochronism The Starmaker <starmaker@ix.netcom.com> - 2025-09-30 00:41 -0700
        Re: Universal anisochronism Tristan Wibberley <tristan.wibberley+netnews2@alumni.manchester.ac.uk> - 2025-10-15 11:03 +0100
  Re: Universal anisochronism Mikko <mikko.levanto@iki.fi> - 2025-09-29 12:43 +0300
    Re: Universal anisochronism Richard Hachel <rh@tiscali.fr> - 2025-09-29 14:18 +0000
      Re: Universal anisochronism The Starmaker <starmaker@ix.netcom.com> - 2025-09-29 08:46 -0700
      Re: Universal anisochronism Python <jpierre.messager@gmail.com> - 2025-09-29 15:52 +0000
        Re: Universal anisochronism Richard Hachel <rh@tiscali.fr> - 2025-09-29 19:19 +0000
          Re: Universal anisochronism Python <jpierre.messager@gmail.com> - 2025-09-29 21:35 +0000
      Re: Universal anisochronism Mikko <mikko.levanto@iki.fi> - 2025-09-30 16:02 +0300
        Re: Universal anisochronism Richard Hachel <rh@tiscali.fr> - 2025-09-30 13:37 +0000
          Re: Universal anisochronism Mikko <mikko.levanto@iki.fi> - 2025-10-01 13:22 +0300
        Re: Universal anisochronism Maciej Woźniak <mlwozniak@wp.pl> - 2025-09-30 15:47 +0200
          Re: Universal anisochronism Python <jpierre.messager@gmail.com> - 2025-09-30 14:00 +0000
            Re: Universal anisochronism Maciej Woźniak <mlwozniak@wp.pl> - 2025-09-30 16:10 +0200
              Re: Universal anisochronism Python <jpierre.messager@gmail.com> - 2025-09-30 14:22 +0000
                Re: Universal anisochronism Maciej Woźniak <mlwozniak@wp.pl> - 2025-09-30 16:31 +0200
                Re: Universal anisochronism Python <jpierre.messager@gmail.com> - 2025-09-30 14:39 +0000
                Re: Universal anisochronism Maciej Woźniak <mlwozniak@wp.pl> - 2025-09-30 16:50 +0200
                Re: Universal anisochronism Python <jpierre.messager@gmail.com> - 2025-09-30 14:52 +0000
                Re: Universal anisochronism Maciej Woźniak <mlwozniak@wp.pl> - 2025-09-30 17:10 +0200
                Re: Universal anisochronism Python <jpierre.messager@gmail.com> - 2025-09-30 15:18 +0000
                Re: Universal anisochronism Maciej Woźniak <mlwozniak@wp.pl> - 2025-09-30 17:47 +0200
                Re: Universal anisochronism Python <jpierre.messager@gmail.com> - 2025-09-30 16:24 +0000
                Re: Universal anisochronism Oleander Sadowski <nadre@ilasa.pl> - 2025-09-30 22:02 +0000
  Re: Universal anisochronism Python <jpierre.messager@gmail.com> - 2025-09-29 13:29 +0000
    Re: Universal anisochronism Maciej Woźniak <mlwozniak@wp.pl> - 2025-09-29 15:50 +0200
  Re: Universal anisochronism Thomas Heger <ttt_heg@web.de> - 2025-10-02 08:46 +0200
    Re: Universal anisochronism Richard Hachel <rh@tiscali.fr> - 2025-10-02 10:31 +0000

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