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From: Thomas Heger <ttt_heg@web.de>
Newsgroups: sci.physics.relativity
Subject: =?UTF-8?Q?Re=3A_Le_pi=C3=A8ge_parfait_=28the_perfect_trap=29?=
Date: Sun, 21 Jul 2024 08:26:01 +0200
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Am Samstag000020, 20.07.2024 um 12:02 schrieb Mikko:
> On 2024-07-18 20:41:13 +0000, Paul B. Andersen said:
> 
>> Den 18.07.2024 21:02, skrev Stefan Ram:
>>> "Paul.B.Andersen" <relativity@paulba.no> wrote or quoted:
>>>> Both SR and GR "covers accelerated frames of reference".
>>>
>>> In special relativity, one can still talk about the proper time
>>> length of a section of an accelerated dude's world line from the
>>> perspective of a non-accelerated guy.
>>
>> The proper time is invariant, and doesn't depend on "perspective".
> 
> However, the effor needed to determine it may depend.
> 
The important point is:

time is a local phenomenon and there exist no such thing as 'proper time'!

It is VERY impotant to consider time as a local phenomenon and not as a 
special case of 'proper time', because otherwise relativity would not work.

So: every inertial observer his his own 'proper time' and carries that 
with him (or better: local time carries the inertial observer with it).

Poincare wrote about this subject and found certain errors in the works 
of Hendrik Lorentz. So Poincare removed unneccessesary terms from what 
he called 'Lorentz transform' and came to a better solution for relativity.

This required to make time local and remove the very idea of 'proper time'.

TH