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
