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Failed to connect to MySQL: (1203) User howardkn already has more than 'max_user_connections' active connectionsPath: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: guido wugi Newsgroups: sci.physics.relativity Subject: Re: Space-time interval (2) Date: Wed, 14 Aug 2024 21:01:30 +0200 Organization: A noiseless patient Spider Lines: 37 Message-ID: References: <3lzcd1NKCT13xkV8yvlh8oaa3Mg@jntp> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Injection-Date: Wed, 14 Aug 2024 21:01:30 +0200 (CEST) Injection-Info: dont-email.me; posting-host="94d09717031bde5bbf7a76366a526366"; logging-data="603603"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX19S524zILrQXPgcODCcJmKewqsyiWhgL4E=" User-Agent: Mozilla Thunderbird Cancel-Lock: sha1:yQN2tvnpbbH+F3FdNN/D8PQx5fU= Content-Language: nl In-Reply-To: Bytes: 2089 Op 13-8-2024 om 12:45 schreef Paul.B.Andersen: > Den 12.08.2024 22:25, skrev Richard Hachel: >> Le 12/08/2024 à 21:06, Python a écrit : >> >>>> Finally, what is ds²? It is just -c².Tr² >>> >>> No! ds^2 = c^2 dt^2 - dl^2. >> >> LOL. >> >> Non : ds²=dl²-c²dt² > > https://paulba.no/pdf/TwinsByMetric.pdf > Chapter 1. Nice to have a TP simulation, but one needs an app to install. Here's my Desmos "TP simulator" (only the linear case, admittedly, no continuous accelerations here) 4 cases (2x2) shown: 1. Lorentz description ("observed" meaning: measured, back-calculated; showing Lorentz transform effects) 1a: POV hometwin 1b: POV traveltwin 2. "Doppler/Einstein" description ("observed" meaning: actually seeing, looking at, the other twin! Besides Lorentz, additional Doppler effects) 2a: POV hometwin 2b: POV traveltwin https://www.desmos.com/calculator/aoacey9t1v?lang=nl More SRT Desmos examples: https://www.wugi.be/srtinterac.html -- guido wugi