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From: "Paul.B.Andersen" <relativity@paulba.no>
Newsgroups: sci.physics.relativity
Subject: Re: Sync two clocks
Date: Fri, 23 Aug 2024 21:15:36 +0200
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Den 23.08.2024 14:09, skrev Richard Hachel:
> Le 23/08/2024 à 13:23, "Paul.B.Andersen" a écrit :
>>
>> In the world there are millions of clocks which are synchronous
>> in the ECI frame, and the world would be even more chaotic than
>> it is without them. Think if it was no way to tell you when your
>> train or aeroplane would go, and there was no way to tell you
>> when you would arrive at the destination.
>> The world is _very_ dependent on synchronous clocks.
>> The civilisation as we know it couldn't exist without them.
>>
>> And you say it is impossible to synchronise clocks? :-D
>>
>> Paul

> 
> That's not really what I said.
> I said that in the common world, we could use a synchronization in 
> hours, minutes and seconds, to qualify various events.
> But that a synchronization in nanoseconds was only possible under 
> certain conditions, and in particular the creation of a universal time 
> capable of governing all of this.
> However, it is impossible for such a universal time to exist, since 
> according to Hachel (too bad if I contradict Einstein on that) the 
> notion of a plane of universal present time does not exist, it is a 
> powerful thought (like the flat earth) but abstract from reality.
> We will therefore never be able to agree even two watches placed in the 
> same frame of reference. Of course, they will beat at the same speed, 
> that is to say they will have the same internal chronotropy, but each 
> will have its own notion of the surrounding simultaneity, that is to say 
> its own hyperplane of present time.
> 
> R.H.

So you say it is impossible to sync clocks in the ECI frame.

So how can it be millions of clocks which are synchronous
in the ECI frame, many of them with ns precision?

-- 
Paul

https://paulba.no/