This method described is one popularised by Dolan. The advantage is that SH=design lat, and there is no SD. The disadvantage is that deriving declination/calendar curves is more involved.
Simon --- On Thu, 9/11/08, Patrick Powers <[EMAIL PROTECTED]> wrote: > From: Patrick Powers <[EMAIL PROTECTED]> > Subject: 'Folded' Gnomon Declining dials? > To: "Sundial List" <[EMAIL PROTECTED]> > Date: Thursday, September 11, 2008, 4:57 PM > There is an unusual East Declining Vertical Dial on the side > of the > Cathedral (Catedral de Santa María de la Sede) in Seville > (Sevilla) in > Spain. > > It has a gnomon which is 'folded' from the Noon > line rather than being > placed orthogonal to the dial plate along the sub-style > line as is more > usual,. This dial must decline by around 50 degrees to the > East. > > As far as I know there is only one dial of similar > construction here in the > UK (it is SRN 1279 in Hertfordshire) - though there may be > others - and as > a consequence this form of construction has in Britain at > least, been seen > as a rather 'amateurish' form of design. > > However having found this dial in Seville the question > arises: Is this > form of gnomon construction more common than I thought? > Are there more > instances of this form of gnomon design elsewhere and have > they been > produced by what nowadays would be regarded as > 'professional' designers? > > The Seville dial and the one known in the UK may be seen at > > > http://tinyurl.com/4x24my > > Many thanks for any comments > > Patrick > > > > > --------------------------------------------------- > https://lists.uni-koeln.de/mailman/listinfo/sundial --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial
