k.schwarzinger wrote: > > Dear dialists > > Can somebody tell me, in which park in Toru?, Poland this sundial > is put (attachment 14 KB !) ? > Toru? : 53O 01? N 18O 36? O > > If you know this sundial, I have even further questions: > > Construction date ? > Who has produced it ? > How many clock faces contains this sundial ? > Which diameter approximately has the ball ? > Are there further sundials in this park ? > > For your answer I thank you in advance. > > Karl Schwarzinger > Austria > 47° 14' North 11° 27' East > [EMAIL PROTECTED] > http://www.tirol.com/sundial/ > > > Name: Pl_5859.jpg > Part 1.2 Type: JPEG Image (image/jpeg) > Encoding: base64
Dear Karl, I can't answer any of your questions but the dial itself is interesting. Or better, the dials are interesting. As I think to see each dial is a part of a cylinder in which only the EoT curve for one hour is drawn. I would like to know if the endpoint of the gnomon is in the center of the cylinder or is the length of the gnomon longer or shorter than the radius of the cylinder. Both solutions are possible. If the gnomon and the radius aren't equal it is a little more difficult to calculate the EoT curves. For the latitude you mentioned about 17 dials would be needed but if they are all present I can't see in the picture. The longest day will have some more than 16 hours. Best wishes, Fer. -- Fer J. de Vries [EMAIL PROTECTED] http://www.iaehv.nl/users/ferdv/ lat. 51:30 N long. 5:30 E
