Path: ...!news.roellig-ltd.de!open-news-network.org!weretis.net!feeder8.news.weretis.net!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: Athel Cornish-Bowden Newsgroups: sci.physics.relativity Subject: Re: Oh my God! Date: Wed, 25 Sep 2024 17:57:46 +0200 Organization: A noiseless patient Spider Lines: 53 Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit Injection-Date: Wed, 25 Sep 2024 17:57:47 +0200 (CEST) Injection-Info: dont-email.me; posting-host="0392f18171acdefb1ae7c0da9a008115"; logging-data="3937962"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1+TB41c1Y01q8CZS8AYit82tLZPHN6zNiw=" User-Agent: Unison/2.2 Cancel-Lock: sha1:sYxcX951jkThKYzT0n2yHKnQq5g= Bytes: 2966 On 2024-09-25 15:34:35 +0000, gharnagel said: > On Wed, 25 Sep 2024 10:28:12 +0000, Athel Cornish-Bowden wrote: >> >> On 2024-09-25 00:27:09 +0000, Richard Hachel said: >>> >>> I stumbled upon this on Wikipedia... >>> >>> I don't know whether to laugh or cry... >>> >>> Did you see where Minkowski places his simultaneity plans? >>> >>> But that's not it!!! >>> >>> That's not it AT ALL!!! >>> >>> >> >> >> That's clearly not Minkowski's diagram (did he have suitable drawing >> software in the 19th century?), but someone's interpretation of it. I >> hope you're not adopting Thomas Heger's habit of lying about who wrote >> what. >> >>> With a huge dust under the carpet right in the middle (the stupid >>> time-gap of physicists). >>> >>> It's depressing. >>> >> -- >> athel -- biochemist, not a physicist, but detector of crackpots > > Actually, it might be correct. Yes, but it's still not something drawn by Minkovski. > Contrary to what Hachel wrote, there > is no "gap." The presumption in the figure is that the velocities > going and returning are constant with an infinite deceleration at > the turning point. Realistically, the deceleration would be finite. > Consequently, the simultaneous line would move smoothly from the > point intersecting the vertical line and the upper blue line to a > horizontal line between the turning point and the vertical line > (representing "home"). As the ship began its return journey, the > simultaneous line would move up to the lower red line as depicted. > The movement through the gap can be as swift as desired (a particle > in an accelerator encountering a target would have a very fast > deceleration, but still not infinite). -- athel -- biochemist, not a physicist, but detector of crackpots