Re: What is "local time"?

On 2024-10-16 13:07:58 +0000, Richard Hachel said:

Le 16/10/2024 à 11:03, Mikko a écrit :

On 2024-10-14 11:28:45 +0000, Richard Hachel said:
 

What is "local time" in relativity?

 The expression is usually not used in Relativity. In particular,
Einstein did not use it.

 You may be right.
For my part, I firmly believe that a lot of words or concepts should be completely abandoned.

A lot of words and concepts are already abandoned.

This will make many relativity lovers jump, I think, but I think it is "necessary for the song" and that one day, we will have to go through it.
Example of words or concepts that are TOTALLY useless, even biased.
"local time",

Not used.

"relativity of simultaneity by change of reference frame",

Can be used as a reminder but does not mean much.

"local present time",

Not used.

"hypercone of present time",

Not used as "present time", if used, is usually defined as a hyperplane,
not a hypercone.

"invariance of the space-time interval",

Space-time interval is invariant.

"time-gap": we don't need all of this.

Does not exist except as a false impression from an approximation
so only rarely used.
--
Mikko