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Path: ...!weretis.net!feeder6.news.weretis.net!feeder8.news.weretis.net!pasdenom.info!from-devjntp Message-ID: <abNSmxxCOUCuhg0L0zYNNcPLNjQ@jntp> JNTP-Route: news2.nemoweb.net JNTP-DataType: Article Subject: Re: The most ridiculous science mistake in history. References: <1qqxctr.cx8smcpwxnigN%nospam@de-ster.demon.nl> <321e5265d8de0bce57ba3d670f4fe968@www.novabbs.com> <PiGr-g3dkpLep8CvZQhYLYjH_zU@jntp> <3517ce074d282ba0402c34c1289277e8@www.novabbs.com> <PFCsU6HxkpVQyKN-LwHpRFqyhuo@jntp> <bcb49d02c32e25cfbf045d957378f3be@www.novabbs.com> <iNb3BWr2umKIKnzAaZZrQWIaMCg@jntp> <uurfgq$8j5r$1@i2pn2.org> <dof1g-GR_KtjWEGgnz5v5Z9MeFQ@jntp> <uv4438$j7q5$1@i2pn2.org> Newsgroups: sci.physics.relativity JNTP-HashClient: aDycfOI9rRKdVIUIsqYgEPYR9gY JNTP-ThreadID: eadae7722aa4042797d8a9dd39fac8b4@www.novabbs.com JNTP-Uri: http://news2.nemoweb.net/?DataID=abNSmxxCOUCuhg0L0zYNNcPLNjQ@jntp User-Agent: Nemo/0.999a JNTP-OriginServer: news2.nemoweb.net Date: Tue, 09 Apr 24 20:49:42 +0000 Organization: Nemoweb JNTP-Browser: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36 Injection-Info: news2.nemoweb.net; posting-host="e8cbf2474b472b9bb79db3dccb6a856bc1d05409"; logging-data="2024-04-09T20:49:42Z/8811432"; posting-account="4@news2.nemoweb.net"; mail-complaints-to="julien.arlandis@gmail.com" JNTP-ProtocolVersion: 0.21.1 JNTP-Server: PhpNemoServer/0.94.5 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-JNTP-JsonNewsGateway: 0.96 From: Richard Hachel <r.hachel@tiscali.fr> Bytes: 2678 Lines: 35 Le 09/04/2024 à 21:14, "Paul B. Andersen" a écrit : > Den 09.04.2024 16:26, skrev Richard Hachel: > For example, if ϕ = π/4 and v = 0.8c, Vapp = 1.3c > > If Vapp ≠ 0, Stella will never reach the Earth, obviously. > So this apparent speed is of no interest for the twin 'paradox', > even if it is interesting for 'superluminal jets'. > > So what's your point? If ϕ = π/4 then if I call µ the angle that the direction of my aim makes with the direction of the object to be studied, I have: µ=3π/4. Then Vapp=Vo/(1+cosµ.Vo/c)=1.842c When Vapp'=Vapp.cosϕ=1.3025c and Vapp"(transversal apparence)=Vapp.sinϕ=1.3025c On this, I agree with you. The apparent transverse speed of a body moving at an angle µ equal to 3π/4 is greater than the apparent speed of this same body moving purely transversely. This is very very counterintuitive, but it is entirely accurate. On this, you are absolutely right, and your calcul is correct. R.H.