Re: Conical Gnomon Advantages

[Dave Bell]

It sure isn't intuitive, but Chris and Brian are correct, as Carl 
demonstrated.
One way to think about it, that  at least gave me that "Aha!" feeling, 
is this:
Yes, as the angle of incidence drops towards zero, a shadow would be 
expected to elongate.
But the disk casting the shadow becomes foreshortened (from the 
viewpoint of the light source) just exactly as quickly as the shadow 
would elongate!

Dave
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