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2 articles trouvés pour ce sujet.
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A sundial on an elliptical cylinder |
2009-07-22 |
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Leo pose la question :
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!
Robert Dawson lui répond. |
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Why counterclockwise? |
2000-02-21 |
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Drew pose la question :
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?
Chris Fisher lui répond. |
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