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From: Athel Cornish-Bowden <me@yahoo.com>
Newsgroups: sci.physics.relativity
Subject: Re: Langevin's paradox again
Date: Thu, 11 Jul 2024 21:04:47 +0200
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On 2024-07-11 18:29:51 +0000, Richard Hachel said:

> Stella traveling an immense semi-circle at the tangential speed of 
> 0.8c, and returning to earth.
> 
> We admit that the rocket can withstand these terrible accelerations,
> and Terrence observes that the U-turn takes place in 40 hours.
> 
> For Stella, the clean time is shorter, only 24 hours.
> 
> The effect is absolute.
> 
> Once this is understood, we see that it all fits together very well, 
> and that there is no need to imagine useless unicorns.
> 
> But what happens during this U-turn for Terrence?
> He ages by 40 hours, and observes that his sister ages by 24 hours 
> between the moment she begins the U-turn, and the moment she completes 
> her U-turn.
> 
> FOR Stella, it's exactly the same thing, when she begins her U-turn, 
> her clock marks 9 years, and she sees over there (direct-live) 
> Terrence's clock marks three years.
> 
> When she finishes her U-turn, she has aged 24 hours, and she sees the 
> earth clock which still marks three years (plus 40 hours).
> 
> Nothing special happens.
> 
> And those who say that something is happening (like gap-time) are 
> morons who don't understand the theory.
> 
> Being an idiot who doesn't understand doesn't matter, personally I 
> remained an idiot for decades before I got the hang of it and was able 
> to write an SR of perfect logic and perfect beauty.


-- 
Athel -- French and British, living in Marseilles for 37 years; mainly 
in England until 1987.