prepared a 3d

Albert Contributed > >http://www.astronomynotes.com/nakedeye/s5.htm >The above quote aligns with my way of thinking on this. It seems to me >that even though the sun is still above the horizon after it travels north >of exact east or exact west, it has moved beyond the point where it would >b

Re: East/West walls and the North/South divide

  Quote: Since the sky appears to rotate around you in 24 hours, anything on the celestial equator takes 12 hours to go from exact east to exact west.   The above quote aligns with my way of thinking on this.  It seems to me that even though the sun is still above the horizon after it travels nort

italian dial

My thanks to those who responded to my puzzled request concerning the Italian dial on the church at San Gimignano. In the end Frans Maes cleared it up by revealing that the dial is no more than an artist's construction, albeit with some meaning. It is not gnomonic, though. Frank 55N 1W -- Fra

East/West walls and the North/South divide

Hi Gianni, > In my opinion the Waugh's statement is correct if we think only > to the sundials in the North hemisphere (as Waugh did). Yes, you (and Mr Waugh!) are quite right of course... > For this reason it seems to me a little " trick " to consider the > period of illumination of the South