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Quandaries & Queries
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 Topic: 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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