Dear list members, I am quite new of this list, so I don't know if this topic has been already discussed. I would like to make a sundial on a west declining wall of my house, but I have some problems in the measurement of the declination angle of the wall. I have used different methods: a vertical stylus, an horizontal one, the angle formed by the shadow of a gnomon and the perpendicular to the wall at the real noon of the place, but I have always obtained different results (up to 8 degrees). Can you help me suggesting me which is the best method for the measure?
Thank You in advance Guido Flamini
