Re: Sync two clocks

Le 23/08/2024 à 13:23, "Paul.B.Andersen" a écrit :

 

I would be very happy to understand you and for you to be able to define your words.

 All the "words" used in SR are defined in any book about relativity,
but you have to read it yourself.
 I will remind you:
 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.