For a South vertical dial it is 45° The orbit of the Sun are cut by the horizon and by the dial. Moving to North from 45°, what the winter solstice orbit losses is more then what the summer solstice orbit gains. It is the same thing moving to South and changing winter with summer.
ciao Fabio Savian ----- Original Message ----- From: "John Carmichael" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Cc: "Sundial List" <sundial@rrz.uni-koeln.de> Sent: Thursday, July 17, 2003 4:42 PM Subject: Best latitudes for sundials? > Here's something for you to think about. > > If you ask the question: What is the best latitude(s) for a particular type > of sundial? How would you answer that question? How would you define "best > latitude". > > One way of defining best latitude(s) would be those latitudes where the > sundial type functions for the maximum number of hours in a year. (this is > the same as maximum number of hours its face receives sunlight). > > Using this definition, what would be the best latitude for a south vertical > wall dial in the northern hemisphere? Where would it function for the > greatest number of hours in a year? How bout a horizontal dial or an > equatorial? > > Note: Forget the effects of cloudy weather, horizon pollution and, eclipses > at different latitudes! > > John > > John L. Carmichael Jr. > Sundial Sculptures > 925 E. Foothills Dr. > Tucson Arizona 85718 > USA > > Tel: 520-696-1709 > Email: [EMAIL PROTECTED] > Website: <http://www.sundialsculptures.com> > ----- Original Message ----- > From: <[EMAIL PROTECTED]> > To: "John Carmichael" <[EMAIL PROTECTED]> > Sent: Wednesday, July 16, 2003 11:51 PM > Subject: Re: vertical wall dial latitudes? > > > John > > > But I've changed my mind. I'm not going to say > >that anymore just in case someone from Finland writes! > > Or even Svalbard at 78° North where they are soon to receive their first > ever sundial. ;-) > > You've given yourself quite a task of late. > > One of my most-used 'tools' is the 'Universal Diallists' Companion' which > Mike Shaw used to supply. Whenever I get into a conceptual knot about e.g. > factors affecting the illumination of a north facing wall it always comes to > my aid. > > Have fun > > Tony > > > > > - -
