That sundial is not 1 spot projected on the floor, but the whole sundial pattern projected on the floor.
On the floor you only need 1 readingmark, nothing more.
But the shadow of a spot on a window will be very difficult to find on a sunlit floor because the light of the sunlit floor is reflecting in every direction and also over the shadow spot so that shadow spot will be less clear. The bright spot of sunlight from a hole in a closed wall/ceiling will therefore much easier to find in a relative dark area.
Thibaud Chabot At 08:40 06-09-2003 -0700, you wrote:
Seriously, it should work fine. For yet another variant, see E. Roebroeck's projection sundial in the Netherland's, Dial 8 in the Stained Glass Sundials photopage, linked from http://tinyurl.com/frf4 Dave-
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