Article View: sci.physics.relativity
Article #7341Re: Speed of light is variable says Einstein
From: N:dlzc D:aol T:com (dlzc)
Date: Sun, 16 Sep 2007 18:43
Date: Sun, 16 Sep 2007 18:43
48 lines
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3023 bytes
Dear Oncle Dom: "Oncle Dom" <dom.caudron@wanaNULLdoo.fr> wrote in message news:46ed76f3$0$5112$ba4acef3@news.orange.fr... > DDP3000@gmail.com dans son message > 1187486327.521094.68680@w3g2000hsg.googlegroups.com, > nous a fait l'honneur d'οΏ½crire: >> Measured light speeds: Galileo, 1667, "too fast to measure this way." Roemer, 1675, 215.000+-100,000 >> Birge, 1929, 299.796 km/sec >> Mittelstaedt, 1928, 299.778+-20 >> Michelson et al., 1932, 299.774+-11 > Michelson died on 1931 > alii were Pease and Pearson > >> Michelson et al., 1935, 299.774+-4 >> Anderson, 1937, 299.771+-10 >> Huttel, 1940, 299.771+-10 >> Anderson, 1941, 299.776+-6 >> Birge, 1941, 299.776+-4 >> Dorsey, 1945, 299.773+-10 > Better mesures appears after 1947 They had better time transfer standards and procedures in the 40's. >> Since 1972 the speed of light is DEFINED at >> 299.792.458+-0.001, NOT measured. Actually established by the international community in 1983, after a final measurement. In 1960 to 1983, the meter was defined by wavelengths of light. The Pt-Ir length standard bar was demonstrably increasing length by about 1 part in 10^8 per year. >> No effort to measure the speed will be made since >> then. > Some others mesasures were made, according to > the BIPM Agreed. After 1983, any such attempt would be a study in locating measurement errors. David A. Smith
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X-Google-Thread: 10f545,66145f633ff3a23c X-Google-Thread: 103d8c,66145f633ff3a23c X-Google-Thread: fa4c1,5d725dc22cea8bd5 X-Google-Thread: f74ae,5d725dc22cea8bd5 X-Google-Attributes: gid10f545,gid103d8c,gidfa4c1,gidf74ae,public,usenet X-Google-Language: ENGLISH,ASCII Path: arc1-ca.pugleaf.net!g2news2.google.com!news2.google.com!border1.nntp.dca.giganews.com!nntp.giganews.com!wns11feed!worldnet.att.net!216.77.188.37!bigfeed2.bellsouth.net!news.bellsouth.net!hwmnpeer01.phx!news.highwinds-media.com!hw-filter.phx!newsfe16.phx.POSTED!53ab2750!not-for-mail From: "N:dlzc D:aol T:com \(dlzc\)" <dlzc1@cox.net> Newsgroups: sci.physics.relativity,de.sci.physik,fr.sci.physique,sci.astro References: <f9h17k$ndp$2@aioe.org> <2Z_ui.27237$RX.20115@newssvr11.news.prodigy.net> <23223.4B1a5.88062.40534.85318@quantumworldz.com> <LGnvi.3258$i85.661@nlpi061.nbdc.sbc.com> <1186897733.841438.76070@k79g2000hse.googlegroups.com> <1187486327.521094.68680@w3g2000hsg.googlegroups.com> <46ed76f3$0$5112$ba4acef3@news.orange.fr> Subject: Re: Speed of light is variable says Einstein Lines: 50 X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader: Microsoft Outlook Express 6.00.2900.3138 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3138 X-RFC2646: Format=Flowed; Original X-NFilter: 1.2.0 Message-ID: <sPeHi.36690$L_7.23384@newsfe16.phx> Date: Sun, 16 Sep 2007 11:43:52 -0700 NNTP-Posting-Host: 68.106.250.76 X-Complaints-To: admin@cox.net X-Trace: newsfe16.phx 1189968216 68.106.250.76 (Sun, 16 Sep 2007 11:43:36 MST) NNTP-Posting-Date: Sun, 16 Sep 2007 11:43:36 MST Organization: Cox