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From: Thomas Heger <ttt_heg@web.de>
Newsgroups: sci.physics.relativity
Subject: Re: [SR and synchronization] Cognitive Dissonances and Mental
 Blockage
Date: Wed, 21 Aug 2024 08:30:08 +0200
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Am Dienstag000020, 20.08.2024 um 08:42 schrieb Python:
> Le 20/08/2024 à 08:39, Python a écrit :
>> Le 20/08/2024 à 08:30, Thomas Heger a écrit :
>>> Am Montag000019, 19.08.2024 um 14:56 schrieb Python:
>>> ...
>>>>> There is also no equation, which could eventually be interpreted as 
>>>>> delay calculation.
>>>>
>>>> As I've shown there is. A single step from the provided equations
>>>> leads to t_A = t_B - (AB)/c
>>>>
>>>>> Delay for a signal from A->B in distance x would be:
>>>>>
>>>>> x=c*t => delay (A->B)= x/c
>>>>>
>>>>> Extremely simple, isn't it?
>>>>
>>>> Extremely stupid insteed x=c*t is not generally true. x/c is
>>>> not at all the delay your asking for. (AB)/c is such a delay.
>>>
>>> Einstein defined two coordinate systems (K and k).
>>>
>>> System k was placed with its center upon the axis of x of system K.
>>>
>>> So the value 'x' is a coordinate in respect to system K  with 
>>> distance |x| to system K's center.
>>>
>>> Now I use this setting and place A in the center of K and B in the 
>>> center of k.
>>>
>>> So: the distance from A to B is x.
>>>
>>> Well, yes, this was a little bad, because I had to explain it in the 
>>> first place, before I could use this setting.
>>
>> What you "explain" is, again, something you made up out of nothing.
>>
>> Systems K and k are even defined yet in paragraph 2.
>>
>> It makes basically no sense to put the center of K at A and the
>> center of k at B. K and k are in relative motion while clock-A
>> and clock-B are mutually at rest. So your "setting" is setting
>> v to 0.
> 
> Addendum : "the distance from A to B is x": this is wrong too.
> x is the coordinate of an event in system K, it is not, in
> general, the distance between origins of K and k.

'x' is a generic coordinate in system K and means a distance from the 
center of K to a point on the x-axis.

Since system k was placed with its center upon the x-axis and B in the 
center of k, the distance from A to B would actually be x.

But, of course, your critique is valid and you should not use generic 
variables for special purposes.

Therefore I made already the proposal to call the distance from A to B 'd'.


BTW: x was not meant as coordinate of an event, because system K and k 
were defined as Euclidian coordinate systems.

Such a coordinate system does not contain time in any way, hence cannot 
address events.

...

TH