Hello Gianni
Thank you for your message and image. Your suggestion is great. Unfortunately it will not apply to the case in point because of the place the dial is supposed to the placed: in the junction of two roads, in the open air, subject to a lot of dust. It has to be easy to be read by the motorists driving by and, certainly, should not require much maintenance. I think your idea is great for some interior garden or certain urban regions. Thank you. - fernando Gianni Ferrari wrote: > Dear Fernando, > I also try to give you some suggestion for your sundial that contemporarily > " has to be vertical" to be seen comfortably and " has to be horizontal" to > have the possibility to work during the whole year . > > For me a type of sundial that can satisfy both conditions is a reflection > sundial with a tilted - almost horizontal - small mirror (always > enlightened from the sun) and with the lines drawn on a vertical plane > . > The project is not difficult enough and, if you succeed in understand the > Italian language, I can send a program - written by me - to make the > calculation (or I can make them for you) > The program has several possibilities included that to look for the > approximate orientation of the mirror, a program to help to fix the mirror > with the wanted angles and one for the search of the same angles after > having fixed it. > > I've tried to calculate a sundial with Solar Local Time with the Latitude of > Brasilia with a vertical plane (wall) facing South and a mirror tilted of > 35 degrees. > I attach an image of the result. > The mirror is distant 100 from the plane and the rectangle is 600 x 500 > (it's an example) > If you want the wall facing North the mirror has to be tilted 15 d. (in the > opposite direction) > > Best wishes Gianni > > ------------------------------------------ > Ing. Gianni Ferrari > Via Valdrighi, 135 > 41100 - MODENA ( ITALY ) > EMail : [EMAIL PROTECTED] > http://members.tripod.com/meridiane/index.htm > > ------------------------------------------------------------------------ > Name: Brasilia.JPG > Brasilia.JPG Type: JPEG Image (image/jpeg) > Encoding: base64 -- Fernando Cabral Padrao iX Sistemas Abertos mailto:[EMAIL PROTECTED] http://www.pix.com.br Fone Direto: +55 61 329-0206 mailto:[EMAIL PROTECTED] PABX: +55 61 329-0206 Fax: +55 61 326-3082 15º 45' 04.9" S 47º 49' 58.6" W 19º 37' 57.0" S 45º 17' 13.6" W
