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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 08:43:35 +0200
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Am Dienstag000020, 20.08.2024 um 11:38 schrieb Richard Hachel:
> Le 20/08/2024 à 08:02, Thomas Heger a écrit :
>> Am Montag000019, 19.08.2024 um 14:56 schrieb Python:
> 
>> I take as example two spaceships in 1 lightseconds distance, which are 
>> called A and B.
> 
> AB = 1 lightsecond
> 
>> Both have a HUGE clock strapped to that spaceship and use a VERY HUGE 
>> telescope to read the clock of the other ship.
>>
>>
>> Now clock A shows 12 o'clock and zero seconds.
> 
> "Now" for A.
>> Ship B reads this at time 12 o'clock plus 1 second,
> 
> Si sa montre est synchronisée en convention Eisntein.
> 
>> but turns the own clock (showing 12 o'clock plus one seconds) back by 
>> one second.
> 
> Dans ce cas, B est parfaitement synchronisé sur A, c'est à dire que B 
> "vit" exactement dans la
> même simultanéité que A, dans le même instant présent que B.

No, this is WRONG!



if you do not add the delay, your visions of remote events are not a 
representation of events at the same time.

You simply cannot take an event seen in, say, 1 million light years 
distance as happening now.

Instead you should subtract the delay (1 million years in this case) and 
say, that this events happend 1 million years ago (not!!! now).

The same problem occurs also in much smaller distances, say between 
Earth and Moon.

Earth and Moon are a particular good choice, because they are roughly 
one light-second apart.

Now we can simply assume two stations, one on Earth and one on the Moon, 
which try to synchronize clocks.

Those would not use Einstein's method, because that is not mutually 
symmetric.

Instead you would 'ping' the remote station, measure the dealy and add 
half of the value to the time transmitted with a coded timing signal.


....


TH