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Newsgroups: sci.physics.relativity
Subject: Re: Relativistic synchronisation method
From: nospam@de-ster.demon.nl (J. J. Lodder)
Reply-To: jjlxa31@xs4all.nl (J. J. Lodder)
Date: Tue, 31 Dec 2024 16:29:30 +0100
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Paul.B.Andersen <relativity@paulba.no> wrote:

> Den 22.12.2024 22:15, skrev Richard Hachel:
> > Le 22/12/2024 � 20:56, "Paul.B.Andersen" a �crit :
> >> Den 22.12.2024 14:35, skrev Richard Hachel:
> >>> Le 22/12/2024 � 14:00, "Paul.B.Andersen" a �crit :
> >>>>
> >>>> I want you to answer my simple questions in a way I can understand.
> >>>>
> >>>> I will reformulate my question so you will only have to
> >>>> answer "YES" or "NO".
> >>>>
> >>>> Here we go:
> >>>>
> >>>> Richard, do you own a watch of some kind?
> >>>>   'yes' or 'no', please!
> >>>>
> >>>> Do you use the internet to set your watch?
> >>>> (or is your watch a computer on the net?)
> >>>>   'yes' or 'no', please!
> >>>>
> >>>> Do you use a mobile network to set your watch?
> >>>> (or is your watch a mobile phone?)
> >>>>   'yes' or 'no', please!
> >>>>
> >>>> Do you use GPS to set your watch?
> >>>> (or is your watch a GPS-receiver?)
> >>>>   'yes' or 'no', please!
> >>>>
> >>>> Do you use public radio or TV to set your  watch?
> >>>> (or is your watch on a radio receiver or a TV?)
> >>>>
> >>>> Do you expect your watch to show the same as the clock on
> >>>> the wall of a railway station or an airport (within a minute or so)?
> >>>>   'yes' or 'no', please
> 
> >>>
> >>> Everything you say is true.
> >>>
> >>> So I can answer "yes, absolutely" to all your questions.
> 
> >>
> >> OK. Thanks for a clear answer.
> >>
> >> You expect your watch to be synchronous with the clock on the wall
> >> of a railway station or an airport an airport within a minute or so.
> >>
> 
> > 
> > You still don't understand what I'm trying to tell you (it's been four
> > decades).
> 
> Yes, your clear answer to my question was easy to understand.
> 
> My question was:
> "Do you expect your watch to show the same as the clock on
>   the wall of a railway station or an airport?"
> 
> Your answer was 'yes'.
> 
> So you expect the clock on the railway station to be synchronous with
> your clock.
> 
> > 
> > We breathe, we blow.
> > 
> > We have a little coffee, and we hold our heads in our hands.
> > 
> > WE CANNOT absolutely synchronize two watches with each other, because it
> > is physically impossible.
> 
> Right.
> There is no such thing as "absolute synchronisation".
> It is meaningless because it is no "absolute time".
> 
> Your clock and my clock and the clock on the railway station
> in Paris are synchronous in the non-rotating Earth centred
> frame of reference (ECI-frame).

You keep repeating this mistake.
TAI, hence UTC, is defined as time on the rotating geoid,

Jan