David, have a look at the bifilar sundials article on The Compendium 24-2 : "Bifilar sundials within everyone's means" (let me know if you cannot reach it). Then download the "Orologi Solari" program that can be used to design almost every kind of bifilar sundials. And let me know about every doubt you may have. Kind regards. Gian Casalegno
Il giorno ven 27 set 2019 alle ore 17:33 David Andersson < [email protected]> ha scritto: > In message < > caokdy5chx5cvb8u1wt6vfbkmydurwp7z4pkz_jg6o5li4pa...@mail.gmail.com> > Michael Ossipoff <[email protected]> wrote: > > > I like the pond suggestion, It hadn't occurred to me, and I hadn't heard > it > > before. > > > > Michael Ossipoff > > 40 F > > September 27th > > 1101 UTC > > > Just like yourself, I never thought of using a surrounding water- > barrier to protect any sundial from vandalism - but I tend to > agree with the people who see that an interactive Analemmatic is > probably best, and is almost intuitive how it works (so no great > explanation, apart from "stand on today's date" is necessary). > > > However, I would like to have some further information on the > "bi-filar" sundial mentioned by Linda Reid - as I am intrigued > that the time is indicated by the INTERSECTION of shadows cast > by two horizontal gnomons. I have never seen this type of dial, > so I would be grateful if anybody can send a diagram (or even a > photograph) of one to this Mailing List - plus if it is 'equi- > angular', I can see that it will be much easier to manufacture. > > I assume the two horizontal gnomons have to be 'adjustable' in > some way, if the dial has to deal with Latitude variations - and > with Longitude/EoT being dealt with, by rotating its Hour-ring? > > > Regards, > > David Andersson. > > > -- > --------------------------------------------------- > https://lists.uni-koeln.de/mailman/listinfo/sundial > >
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