Ben Hoffmann wrote:
Dear Ross,
I have a comment on your comment! I agree with the issues as discussed
about parallax - however, if you were to use a solar simulator like that
discussed by Thibaud Taudin-Chabot, and place the very tip of the
gnomen/style at the center of the spherical
Wm. S. Maddux wrote:
Dear Tom,
So far on the list, various suggestions have addressed simulating the
angular size of the sun's apparent disk as a source, but if you are
interested in the geometry of the actual dial-style system as a whole, you
must deal with the problem of the optical
Hello Ross and other list members,
Dr. McCluney asked:
If you use a slide projector with a half-degree circular aperture
stop
How many millimeters diameter of a circular aperture stop will produce a
beam spread of a half-degree? If the focal length of the projection
lens is f in
At 11:03 28-11-97 -0800, you wrote:
Seattle's long and rarely sunlit winter has begun in earnest. I'm
experimenting with building dials and want to test the ability of different
gnomon designs to cast shadows.
Does anyone have ideas on building simulated sources of sunlight? I'm
guessing a
Dear Tom,
So far on the list, various suggestions have addressed simulating the
angular size of the sun's apparent disk as a source, but if you are
interested in the geometry of the actual dial-style system as a whole, you
must deal with the problem of the optical distance of the sun. For
On Fri, 28 Nov 1997, Tom Kreyche wrote:
Seattle's long and rarely sunlit winter has begun in earnest.
Or, as a tagline on an astronomy list has it:
Where the Sun is considered a deep-sky object!
I'm experimenting with building dials and want to test the ability of
different gnomon designs
Seattle's long and rarely sunlit winter has begun in earnest. I'm
experimenting with building dials and want to test the ability of different
gnomon designs to cast shadows.
Does anyone have ideas on building simulated sources of sunlight? I'm
guessing a reasonable approximation is to simply
