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sundial

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A sundial on an elliptical cylinder 2009-07-22
From Leo:
I want to build a sundial where the shadow falls on an elliptical cylinder. I can calculate the coordinates of the points on the cylinder that I want to mark. My problem is that I will have to make the surface as a flat sheet and bend it into an elliptical shape. However, I cannot work out a scheme to transfer the coordinates I know into a distance that will work when I bend the shape. Help!
Answered by Robert Dawson.
Why counterclockwise? 2000-02-21
From Drew:
Why do the numbers of quadrants in a graph increase in a counter clockwise pattern? Why aren't they numbered increasingly in a clockwise pattern?
Answered by Chris Fisher.
 
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