In the photograph we may see the hour lines of two different monofilar sundials that mark ( both ) the standard time (hour of the clock).
The concentric circles are the daily lines (date's lines) and almost certainly mark the beginning of the months. Where the shadow of the vertical style crosses the line of the date nearest to the day of observation, we may read the hour on one of the set of hour lines - those that are numbered with the Roman numerals on the external circle (I, II, III, IV,..) This is a classical Azimuthal sundial. Where the shadow of the tilted style (polar style) crosses the line of the date nearest to the day of observation, we may read the hour on the second group of hour lines - those that are numbered with the Arabic numerals on the external circle (1,2,3,4,..) I don't understand neither the excessive thickness of the styles (grat thickness of the shadow and therefore great uncertainty of reading), nor their pointed shape. I think also that this sundial is very difficulty to read, especially for not experienced dialists :-) Gianni Ferrari P.S. I have calculated and drawn both the dials to verify my suppositions :-) ----- Original Message ----- From: <[EMAIL PROTECTED]> To: "Sundial List" <[email protected]> Sent: Tuesday, November 08, 2005 9:45 AM Subject: Sundial Deutsches Museum Munich > Dear Sundialists, > > http://static.flickr.com/23/27737182_f3c720e8e1.jpg?v=0 > > this Sundial is at the Deutsches Museum at Munich. At first I thought > it is a spider-type sundial (Sonnenuhrenspinne) - but what is the > second gnomon for? > can anyone explain? > > hannes > > > - > -
