Hi Warren, I don't know what's best for John. On a horizontal dial for 33 degrees the hourlines are closer, however the dial will work all day, if there are not to many surrounding buildings or trees. On a south facing wall, which means -57 degrees latitude, not all the hours can be read in summer. On the attached picture you may see the difference. The dials are for local suntime at John's latitude. Each dial has its own advantages and disadvantages. What choice would you make, John?
Best, Fer. Fer J. de Vries [EMAIL PROTECTED] http://www.iae.nl/users/ferdv/ Eindhoven, Netherlands lat. 51:30 N long. 5:30 E ----- Original Message ----- From: Warren Thom <[EMAIL PROTECTED]> Cc: Sundial List <[email protected]> Sent: Wednesday, February 23, 2000 1:04 PM Subject: Re: R: azimuthal gnomon length problem > Hi Fer, > > Now I am starting to see the low latitude problem for azimuth dials - which was > the original problem described by John C. But for him, at 33 degrees latitude, > a vertical south facing dial (equal to one at 57S) would be better than > horizontal - but for me a vertical decliner would be worse. I will take the > suggestion to use a vertical line for the shadow maker and see what I get. > Ref:June 1996 issue of the BSS on "Azimuth Sundials Horizontal and Vertical" by > G. Fantoni > > Thanks, > > Warren > Attachment converted: Macintosh HD:spin4.gif (TIFF/JVWR) (0000F43D)
