Thanks for the correction. Someday it will be nice to have time to get back to active dialling.
--- On Wed, 4/29/09, Fred Sawyer <fwsaw...@gmail.com> wrote: From: Fred Sawyer <fwsaw...@gmail.com> Subject: Are there any accurate mass-produced or reproduction horizontalsundials? To: "Sundial List" <sundial@uni-koeln.de> Date: Wednesday, April 29, 2009, 10:51 AM Thad, "And if a person wants to correct for longitude, they can tilt their dial up a degree on the left or west side for every degree into the time zone they are. " Not so. The adjustment to be made requires a rotation around the polar axis - you don't get that simply be lifting the east or west side of the dial - that's equivalent to rotating around the horizontal meridian line, which would take the gnomon out of the meridian plane. The correct way to do this has been covered a number of times in The Compendium - see in particular 3 articles on the topic in the March 2000 issue. Fred On Wed, Apr 29, 2009 at 10:41 AM, Thaddeus Weakley <thadweak...@yahoo.com> wrote: > Horizontal dials are very nice in that if they are made well to begin with, > can easily be adjusted for any place in the world. When mounting a > mass-produced dial made for 40 or 45 degrees in the UK, simply place a wedge > of sorts under the northern side to bring the gnomon angle up to the higher > latitude angle. Likewise the southern edge of the dial to lower the gnomon > angle to match that of lower latitudes. > > And if a person wants to correct for longitude, they can tilt their dial up > a degree on the left or west side for every degree into the time zone they > are. > > Thad > 45.3N 73.3W > > --- On Wed, 4/29/09, Chris Lusby Taylor <clusbytay...@enterprise.net> wrote: > > From: Chris Lusby Taylor <clusbytay...@enterprise.net> > Subject: Re: Are there any accurate mass-produced or reproduction > horizontalsundials? > To: sund...@rrz.uni-koeln.de, clar...@aol.com > Date: Wednesday, April 29, 2009, 5:42 AM > > > Hi Ken, > The situation may be better in the USA, but here in the UK the main problem > is that practically all garden centre horizontals I've seen (I try to avoid > them) are made for a much lower latitude than our 50 to 58 degrees. > My advice to people asking this question has been to go for an adjustable > dial, which mostly means an armillary sphere, which is going to cost a lot > more than $100. > > Several dialists with Web sites have published guidelines for purchasers: > how to identify a good sundial by looking at its angles, the 6am-6pm line, > noon gap and so on. There's been good discussion on this list, too - you > could look in the archives. > > I'd say that the noon gap is likely to be the least of your problems. > > Good luck > Chris > > > ----- Original Message ----- > From: clar...@aol.com > To: sund...@rrz.uni-koeln.de > Sent: Wednesday, April 29, 2009 9:47 AM > Subject: Are there any accurate mass-produced or reproduction > horizontalsundials? > Hi everyone, > Some people ask me for recommendations on what sundial to buy. But > most do not want to spend a lot of money. Are there any mass-produced or > reproduction horizontal sundials that are reasonably accurately made? > Where the gnomon is on the 6 ‘o’clock line, with a noon gap, and both > styles have a clean edge and under $100.00. > A lot of museums sell the small 4 ½ inch diameter gray zinc sundial > that looks like it is made correctly till you notice that there is no noon > gap for only about $15.oo now. If only it was made correctly. I am > looking for something larger for a garden. > Thanks in advance, > Ken Clark > Elizabethtown, PA > ________________________________ > Big savings on Dell XPS Laptops and Desktops! > ________________________________ > --------------------------------------------------- > https://lists.uni-koeln.de/mailman/listinfo/sundial > > --------------------------------------------------- > 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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