Nathaniel, the last issue of The Compendium contains an article about my program Orologi Solari that now includes bifilar sundials design.
Note that bifilar sundials may include two straight wires as well as catenaries and/or wires arbitrarily shaped in space. All the features of the program (such as a wide range of time and astronomical systems, data export both in numerical and in graphical format, simulation etc.) are applicable to this new family of sundials too. You can find a presentation on the subject at the following address: http://www.sundials.eu/download/bifilareENU.pdf An example of a bifilar sundial with arbitrary shaped wires can be seen at https://www.youtube.com/watch?v=tD22oba6RyQ&t=18s This is a bifilar sundial with a double helix in front of a polar plane. The design was performed with Orologi Solari. Then the result was exported to a DXF file, slightly modified with a CAD program and then imported to SketchUp for the simulation (OS can perform this same simulation however the point of view is fixed in front of the wall). Hope this can be helpful. Especially dial simulation with OS can be a great help for the evaluation of the feasibility of a bifilar sundial at your location. Greetings. Gian Casalegno 2017-05-28 22:35 GMT+02:00 Nathaniel Shippen <shippenn...@gmail.com>: > I've seen some info on bifilar sundials, and they look very interesting. I > thought I would try to make a simple one (if that is possible). An east > and/or west facing vertical dial would be the most useful at my location. > Actually the surfaces I would be using decline a little south of west and > north of east (and also recline slightly). I would be sketching in the time > marks (Hawaii Standard) empirically since I am also some 8 degrees west of > the standard meridian. > > Is this doable? Are the computations for the threads and the point of > origin for the hour lines fairly simple? If yes I'll dig in and do the > necessary research, just don't want to be off on an impossible quest. > > Thank you in advance for your help! > > Nathaniel Shippen > > --------------------------------------------------- > https://lists.uni-koeln.de/mailman/listinfo/sundial > > >
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