Dear Hans, Yes, Roderick Wall is right...
> ... it would work if all your sticks > are parallel to the axis of the > earth. You just need a whole set of polar-oriented gnomons, BUT... You have added an extra constraint... > I would like the little gnomons to be > perpendicular to the face of the dial... No problem. As Roderick almost says: You simply arrange for the face of the dial to be parallel to the plane of the Equator. There is, though, a twist in all this... We are assuming that you want this dial to indicate local sun time. If we relax that assumption, the face of the dial can have almost any orientation. You don't get sun time then. You get what Fabio Savian calls "Alignment Hours". These are much more fun than boring old sun hours and your design would illustrate these hours very well. The only snag is that no one would appreciate your efforts except Fabio, you, me, readers of this list, and anyone living in Paris! Why Paris? Well, the Arc de Triomphe, stands at the centre of a major intersection with 12 streets meeting at the centre. If you stand at the top you can see the sun shining along each street in turn while the sun is shining. What you see are Fabio's alignment hours. Frank King Cambridge, UK --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial
