Path: ...!3.eu.feeder.erje.net!feeder.erje.net!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail From: Athel Cornish-Bowden Newsgroups: sci.physics.relativity Subject: Re: Langevin's paradox again Date: Thu, 11 Jul 2024 21:04:47 +0200 Lines: 41 Message-ID: References: <9oTvw4-YSIPb1dubtdBwcc_MeX8@jntp> <4O9Y8U3gtfBKakbkPS0LmREorbI@jntp> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Trace: individual.net UM9bJZZlO6JxUE9pOQGUKQfJTaeMKbh8Jk2eSwt6bLFYEklFLL Cancel-Lock: sha1:OyAlh3L0e3aT1gUCvLWSiYw3hyI= sha256:dtFhIxAJZjQ8fAIkgF0IfQhsl+oz8U3RBYFAqGLCLPo= User-Agent: Unison/2.2 Bytes: 2490 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.