Re: Relativistic synchronisation method

Den 22.12.2024 22:15, skrev Richard Hachel:

Le 22/12/2024 à 20:56, "Paul.B.Andersen" a écrit :

Den 22.12.2024 14:35, skrev Richard Hachel:

Le 22/12/2024 à 14:00, "Paul.B.Andersen" a écrit :

>
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).

 We must therefore synchronize the two watches on a third virtual watch for which the two events watch A marks noon, and watch B marks noon are SIMULTANEOUS.

My question was:
"Do you use the internet to set your watch?"
Your answer was 'yes'.
So you know you can synchronise your clock to all the millions
of other synchronous clocks showing UTC+1h, to within a second
via internet:
https://time.is/clock
You may call the 'clock' you see on your screen "a virtual clock".
But you don't have to do it at noon, you can do it any time.
<snip>
Happy new year!
--
Paul
https://paulba.no/