I don't see why deriving declination/calendar curves is affected in any way. The nodus position, measured along the style from the root of the gnomon, is the same. It would, certainly, be wrong to measure the nodus height by using its distance perpendicular to the foot of the gnomon, but it's more accurate to measure along the gnomon in any case.
Chris ----- Original Message ----- From: "Simon [illustratingshadows" <[EMAIL PROTECTED]> To: "Sundial List" <[EMAIL PROTECTED]>; "Patrick Powers" <[EMAIL PROTECTED]> Sent: Friday, September 12, 2008 3:30 PM Subject: Re: 'Folded' Gnomon Declining dials? 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 --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial
