Hi Franco-- . I like explanations that can be understood by anyone from at least pre-secondary-school. I believe that such people can understand the sundial and map-projection explanations that I'd use. . To whom would I give explanations?: Primarily to my girlfriend. She isn't interested in math, but that doeesn't mean that those explanations wouldn't be understandable to her if she's interested in them, interested in lisening to them. . I mentioned to her that our windowsill sundial would be a Cylindrical-Equatorial Dial, because it doesn't need any explanation, because it shows the Sun's position in the most direct way. She replied that she has nothing against explanation of the Horizontal-Dial, its hour-lines and declination-lines, and considers it interesting. . So the first windowsill dial here will be a Cylindrical-Equatorial Dial, followed by a Horizontal Dial. . In general, I believe that these subjects can be explained to anyone who is interested in hearing the explanation. . So I'd offer these explanations to anyone to whom I'd suggest or offer a sundial or map-projection. I like the idea of a sundial or displayed map being accompanied by a pamphlet or a page that tells its construction-formula derivation-explanation. . Some say that people aren't interested in explanations, but I suggest that, rather, they're often just resigned to things being not explainable to them. I believe that, when shown a sundial or map, they'd like it explained. . It seems to me that every park, library, museum, plaza, and other public-spaces, should have a sundial. .
------------------ I'm not familiar with those softare products, but I'd have no objecion to their use. I'd use drawings, but of course that software could be helpful too, showing things in ways other than what a drawing can show. 48 W November 20th 1600 UTC . Michael Ossipoff
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