I'm unimpressed. The watch shows that the sun is six minutes fast on December 5th. But the Equation of Time on December 5th is about nine and a half minutes. Is that the best the watch industry can do? I'll stick with my sundials.
Chris ----- Original Message ----- From: "Robert Terwilliger" <[EMAIL PROTECTED]> To: "'Robert Terwilliger'" <[EMAIL PROTECTED]>; "'Mac Oglesby'" <[EMAIL PROTECTED]>; "'Sundial Mailing List'" <[email protected]> Sent: Tuesday, August 05, 2008 12:17 AM Subject: RE: Equazione del Tempo > I'll get it right sooner or later. It's a nice article. > > http://www.timezone.com/library/rdnotebook/200503287777 > > > Bob > > -----Original Message----- > From: Robert Terwilliger [mailto:[EMAIL PROTECTED] > Sent: Monday, August 04, 2008 7:09 PM > To: 'Robert Terwilliger'; 'Mac Oglesby'; 'Sundial Mailing List' > Subject: RE: Equazione del Tempo > > OOps, > > Here is the link to the illustrated discussion of the equation work in a > (very nice) wrist watch. Note the minute hand terminating with the sun. > > Bob > > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On > Behalf Of Robert Terwilliger > Sent: Monday, August 04, 2008 11:12 AM > To: 'Mac Oglesby'; 'Sundial Mailing List' > Subject: RE: Equazione del Tempo > > Mac and all, > > The indication of the equation of time on a mechanical timepiece is usually > done with a "kidney piece" which is basically an analemma shape. > > It looks like this: > > http://www.europastar.com/europastar/photos/05_2006/Blancpain3.jpg > > The kidney piece is at the right foreground in this photo: > > http://people.timezone.com/staff/EquationOfTime/calibre_2120_2808_005.jpg > > Here is an illustrated discussion: > > http://people.timezone.com/staff/EquationOfTime/calibre_2120_2808_005.jpg > > Bob > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On > Behalf Of Mac Oglesby > Sent: Monday, August 04, 2008 6:33 AM > To: Sundial Mailing List > Subject: Re: Equazione del Tempo > > > Dear Frank, > > Thanks for posting the photo of this interesting and attractive time and EoT > pairing. > > I wonder if any of the clock experts on the list would care to comment on > the mechanism that drives the EoT dial. Does anyone have pictures of the > "works" to share? > > Best wishes, > > Mac Oglesby > > > > > >Dear All, > > > >Next to a sundial it is quite common to see a representation of the > >Equation of Time. > > > >One reason for this is so that people can note the time shown on the > >dial and then calculate the time that should be shown on a clock. > > > >There is an implicit assumption that clock time is what the user really > >wants to know and that sundial time is somehow inferior. > > > >In Italy they think the other way round... > > > >Take a look at: > > > > http://www.cl.cam.ac.uk/users/fhk1/EofT.jpg > > > >Here you will see an ordinary public clock showing 12:51 and > >immediately below the clock is a second clock with a single hand that > >indicates the EQUAZIONE DEL TEMPO. In the photograph it shows -6 > >minutes. > > > >Here people can note the time on the clock and calculate the time that > >should be shown on a sundial! > > > >The implicit assumption is that sundial time is what the user really > >wants to know and that clock time is somehow inferior. > > > >Bravo to the Italians! > > > >The photograph was taken on 1 August when the Equation of Time was > >indeed about -6 minutes. > >The main clock was showing Central European Summer Time. > > > >I do not know of a public (outdoor) clock in the U.K. that shows the > >Equation of Time and wonder how much demand there would be for such a > >facililty? > > > >For completeness: the photograph was taken in Piazza Dante in Naples. > > > >Frank King > >Cambridge, U.K. > > > >--------------------------------------------------- > >https://lists.uni-koeln.de/mailman/listinfo/sundial > > --------------------------------------------------- > https://lists.uni-koeln.de/mailman/listinfo/sundial > > > > --------------------------------------------------- > https://lists.uni-koeln.de/mailman/listinfo/sundial > > > > > > --------------------------------------------------- > https://lists.uni-koeln.de/mailman/listinfo/sundial > --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial
