Yvon--
Thanks for providing that information and links. If the links' explanation
seemed satisfactory to one dialist, then I expect that it *is*
satisfactory--and a satisfactory explanation is what I'm looking for.
I'll check out those two links.
Yes, it isn't an easy question, but even a
Michael,
Some years ago, I spent a lot of time to search a simple geometrical
justification of these kind of dial. The best way I found is:
- for the Capuchin: from the orthographic projection of the celestial
sphere on the local meridian (fig. 1)
- for the Universal Capuchin: from the
I'm not asking about the *instructions *for constructing Capuchin and
Universal Capuchin dials. I'm asking about the principle, the explanation,
the justification, for their construction.
Some websites have said or implied that it has to do with an orthographic
planisphere. I'm familiar with the
