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Re: Longitude of Greenwich Observatory
From: Robert Gainer
Date: 2005 Dec 18, 09:47 -0500
From: Robert Gainer
Date: 2005 Dec 18, 09:47 -0500
Dr. Wolfgang Koberer, She arrived in Jolly Harbor, Antigua on December 10th so it would be difficult to see her alongside the Cutty Sark right now. Robert Gainer > > From: "Dr. Wolfgang Koberer"> Date: 2005/12/18 Sun AM 04:30:39 EST > To: NAVIGATION-L@LISTSERV.WEBKAHUNA.COM > Subject: AW: Longitude of Greenwich Observatory > > And to the left you can see "Gipsy Moth IV" - the yacht that Sir Francis > Chichester sailed around the world - in her concrete berth. She has recently > been restored and returned to the place right next to "Cutty Sark". There is > a website www.gipymoth.org where you can read more. > > Wolfgang Koberer > (Another Google Earth addict) > > -----Ursprungliche Nachricht----- > Von: Navigation Mailing List > [mailto:NAVIGATION-L@LISTSERV.WEBKAHUNA.COM]Im Auftrag von Frank Reed > Gesendet: Sonntag, 18. Dezember 2005 05:56 > An: NAVIGATION-L@LISTSERV.WEBKAHUNA.COM > Betreff: Longitude of Greenwich Observatory > > > When you visit the old Royal Greenwich Observatory, you can stand in line > with the transit instrument's building and put one foot on either side of a > stripe in the paving stones and get your photo taken "with one foot in East > longitude and one foot in West". My question is, with various revisions and > refinements in the geodetic system, is that precisely true today? That is, > does > zero degrees longitude still pass right through that transit instrument's > original mounting point by definition? > > For fans of Google Earth (and if you're not a fan, you will become one when > you try it out!), the longitude displayed for this location is 0d 0' 05.36" > W. Pretty close to zero, and I assume that the difference is nothing more > than > the usual difficulty of registering aerial photography exactly in lat/lon, > but maybe the old RGO is drifting... By the way, if you go down to the > river > from here in Google Earth, you can see the spars and even the shadows of > the > shrouds on Cutty Sark. > > If you want Google Earth: > http://earth.google.com/ > > And coincidentally, the lead story on Sky & Telescope's web site this week > is about the renovations and expansion of exhibits at Greenwich: > http://skyandtelescope.com/ > > -FER > 42.0N 87.7W, or 41.4N 72.1W. > www.HistoricalAtlas.com/lunars >