More interesting is to know whether there exist modern timepieces which indicate the solar time. With the possibilities of electronics and a built-in GPS system it can not be so difficult.
Willy Leenders Hasselt in Flanders (Belgium) Visit my website about the sundials in the province of Limburg (Flanders) with a section 'worth knowing about sundials' (mostly in Dutch): http://www.wijzerweb.be Op 8-okt-2016, om 19:32 heeft rodwall1...@gmail.com het volgende geschreven: > Hi all, > > This is an interesting website on equation clocks. > > https://en.m.wikipedia.org/wiki/Equation_clock > > Regards, > > Roderick Wall. > > ----- Reply message ----- > From: "Kevin Karney" <kar...@me.com> > To: "rodwall1...@gmail.com" <rodwall1...@gmail.com> > Cc: "Sundial list" <sundial@uni-koeln.de> > Subject: Longcase Clock with Equation of TIme > Date: Sat, Oct 8, 2016 4:28 AM > > As explained by Fred Sawyer in a recent lecture to the British Sundial > Society, if often worked the other way around... people had an equation table > and all kinds of rules so that they could adjust their clock so that it > matched dial time for as long as possible. > > Dial time was (and still is for some) 'true' time. The acceptance of local > mean time was a slow process. Likewise the acceptance of national mean time > met with a great deal of resistance. In Dorchester in 1858, in the UK, a > judge in a court case found in favour of the plaintiff, since the defendant > was not present at 10:00 o'clock when the case was scheduled. The court was > using GMT. The defendant arrived at 10:00 local mean time - a few minutes > late. He appealed and the appeal judge ruled... > "Ten o’clock is 10 o’clock according to the Time of the Place and the Town > Council cannot say that it is not, > but that it is 10 o’clock by Greenwich > time. Nor can the time be altered by a railway company.… Nor by any person > who regulates the clock on the Town-Hall." > > Unless you lived in a (maritime) city, or had an astronomer on hand, or a > local rich man who went up to the city and owned a chronometer, there was NO > way to set a clock without a Sundial. It all changed with the the arrival of > the telegraph.... I have found that this is something that watch and clock > enthusiasts sometimes forget! > > Kevin > > Sent from my iPad > > > On 7 Oct 2016, at 11:07, rodwall1...@gmail.com <rodwall1...@gmail.com> > > wrote: > > > > Hi all, > > > > In 1730. I think I heard somewhere that. Clock manufacturers also sometimes > > gave a small window sundial to allow you to set your clock. With a equation > > of time table. Is that correct? > > > > Roderick Wall.. > > > > > > ----- Reply message ----- > > From: "Robert Terwilliger" <b...@twigsdigs.com> > > To: "'Ian Maddocks'" <ian_maddo...@hotmail.com>, "'Sundial list'" > > <sundial@uni-koeln.de> > > Subject: Longcase Clock with Equation of TIme > > Date: Fri, Oct 7, 2016 1:00 PM > > > > If you had a similar clock in 1730 - located where you didn't have access to > > another accurate clock, a sundial would be the only way you could set it - > > and to do so you would need to know the equation for the date. > > > > > > > > Bob > > > > > > > > _____ > > > > From: sundial [mailto:sundial-boun...@uni-koeln.de] On Behalf Of Ian > > Maddocks > > Sent: Wednesday, October 5, 2016 12:29 PM > > To: Sundial list > > Subject: Longcase Clock with Equation of TIme > > > > > > > > hi folks > > > > > > > > I was just blundering around the internet when I came across the following > > that may be of interest.. > > > > > > > > A long case clock from 1730 London that has an annual dial for displaying > > the date and the equation of time > > > > http://www.raffetyclocks.com/antique-clocks/d/antique-month-equation-and-yea > > r-calendar-longcase-clock-by-john-topping-london/170271 > > > > It's a premade disk with EoT table that rotates in a year, not a P&G type > > kidney cam, but was new clock complication to me > > > > > > > > greetings from > > > > > > > > Ian Maddocks > > Chester, UK > > 53°11'50"N 2°52'41"W > > frog.happy.froze > > > > > > > > > > > > > > > > --------------------------------------------------- > > https://lists.uni-koeln.de/mailman/listinfo/sundial > > > --------------------------------------------------- > https://lists.uni-koeln.de/mailman/listinfo/sundial >
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