Re: Space-time interval (2)

On Tue, 13 Aug 2024 22:42:02 +0000, Richard Hachel wrote:

>
Le 14/08/2024 à 00:12, hitlong@yahoo.com (gharnagel) a écrit :

>
Richard Hachel wrote:

....
But this perfect present time does not exist.
>
This does not prevent that in our universe, each point considered

is, in

general at a different distance from me, and that it is impossible

for

me to synchronize with it, without desynchronizing myself from it,

and

without desynchronizing myself from the others and so on.
>
R.H.

>
Well, Richard, the GPS disproves your theory, because t' = t, as

Wozniak

is over-fond of saying. (Where , in this case, t' = time in Oslo and t
is the time in Paris.

>
I just explained to you the synchronization used by GPS. Abstract
synchronization, but interesting to be able to use a universal present
time plan (which does not exist in nature).

“There is no point in using the word 'impossible' to describe something
that has clearly happened.” – Douglas Adams

It's a shame, you're not making any effort.
It makes discussions very difficult.
>
R.H.

Disagreeing with you does NOT mean that I'm not making an effort.
The fact is, I see neither reason for nor evidence of this so-called
"universal anisochrony."  It seems to have sprung from the observation
that light travels at a finite speed, but I don't think that has
anything to do with the matter.  True, there is "universal anisochrony"
for observers in SR in different frames, but it IS possible to
synchronize clocks between such frames -- but only for one instant.
But often, that's enough.  It's like:
“Any ship can be a minesweeper.  Once” -- Naval Ops Manual