By the way, those day lines are set on an assumption that at mid-night of full moon night the moon passes the maridian. However, this is not the way it goes. The full moon passes the maridian before or after the midnight. The deviation varies month by month and covers a range up to100 minutes. In all, a simple moon dial like this usually does not give correct solar time.
ChiLian Chiu N25, 121 2010/11/13 Tom Laidlaw <[email protected]> > I found another picture of that sundial in Madrid. According to the > description the complex contains four sundials and two moondials. It looks > like it has a vertical, equatorial, two polars so the ones on the front > must > be moondials, but I don't know anything about how moondials work. It is > still a fascinating work. The link is below. > > > http://commons.wikimedia.org/wiki/File:Plaza_de_la_Puerta_de_Toledo_(Madrid) > _01.jpg#filehistory > > Tom Laidlaw > -----Original Message----- > From: Tom Laidlaw [mailto:[email protected]] > Sent: Friday, November 12, 2010 2:28 PM > To: 'Tom Laidlaw'; 'Willy Leenders'; 'Sundial sundiallist' > Subject: RE: sundial complex in Madrid > > That's the first time anybody try to make a "universal dial" like that. If > I > can figure out the angles, etc. I am going to try to make one. Anyone else > know more about this dial? Who made it, etc.? > > Tom > > -----Original Message----- > From: [email protected] [mailto:[email protected]] > On > Behalf Of Tom Laidlaw > Sent: Friday, November 12, 2010 2:10 PM > To: 'Willy Leenders'; 'Sundial sundiallist' > Subject: RE: sundial complex in Madrid > > Hi there, > > Looks to me like it might be trying to incorporate time zones? > > Tom Laidlaw > > -----Original Message----- > From: [email protected] [mailto:[email protected]] > On > Behalf Of Willy Leenders > Sent: Friday, November 12, 2010 11:53 AM > To: Sundial sundiallist > Subject: sundial complex in Madrid > > Can anyone explain the sundials on the left and right corner columns on the > sundial complex with image address below. > The sundials consist of intersecting curves. > The sundial complex stands in Madrid (Spain). > > > http://www.flickr.com/photos/leokoolhoven/3973477239/sizes/o/in/photostream/ > > > 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' (in Dutch): > http://www.wijzerweb.be > > > > > > > --------------------------------------------------- > https://lists.uni-koeln.de/mailman/listinfo/sundial > > --------------------------------------------------- > https://lists.uni-koeln.de/mailman/listinfo/sundial > > --------------------------------------------------- > https://lists.uni-koeln.de/mailman/listinfo/sundial > >
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