fer j. de vries wrote:
>
> Krzysztof Kotynia wrote:
> >
> > > > Piero Ranfagni wrote:
> > > >
> > > > Dear friends,
> > > >
> > > > I need your help: I'm preparaing a lesson around the mesaurement of
> > > > time. I wolud like to know how old is the first equal hours sundial.Rohr
> > > > claimed that the "Man with the sundial" in the Cathedral of Strasbourg
> > > > is the earliest modern sundial and it dates from 1493. What is your
> > > > opinion? Can you indicate me some books on the subject?
> > > >
> > >
> > > I don't know what dial with eaqual hours is the oldest , but on my site
> > > you may see a sundial in Utrecht, Netherlands, dated 1463.
> > > It is a small dial, still existing and dated.
> > > Follow the link Pictures of sundials in The Netherlands, number 1.
> > > --
> > > Fer J. de Vries
> > > [EMAIL PROTECTED]
> > >
> > Dear Piero,
> > in other countries there are also sundials of equal hours
> > dated earlier than Rohr's example.
> > In the Museum of Jagiellonian University (Krakow, Poland)
> > is beautifully preserved
> > sundial designed by Marcin (Martin) Bylica, the professor of
> > astronomy in that University and carried out in 1485 by Hans Dorn
> > in Vienna in 1485. That sundial and other astronomical instruments
> > (a celestial globe, a very big astrolabe and so called torquetum)
> > Marcin Bylica bequeathed to the University.
> >
> > So I think that sundials with equal hours a earlier that Rohr
> > thinks.
> >
> > Best regards
> > Krzysztof Kotynia
> > lat 51.8N long.19.4E
>
> Dear all,
>
> We have now:
> Strassbourg, France 1493
> Krakow, Poland 1485
> Utrecht, Netherlands 1463
>
> But where is the oldest?
> I am not for sure that the Dutch one is the winner.
> Who knows of older ones?
>
> Happy dialling, Fer.
>
> --
> Fer J. de Vries
> [EMAIL PROTECTED]
> http://www.iaehv.nl/users/ferdv/
> lat. 51:30 N long. 5:30 E
No equal hours sundial in Europe in the 14th century? In that period
equal hours mechanical clocks were working. Which relationship between
clocks and sundials?
Thank you for your help and greetings. Piero Ranfagni
--
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