Dear All, As proven in a separate tread on "Sun elevation tool/ horizontoscope", stereographic projection is a fascinating geometric construction with great potential in gnomonics.
During last year I explored the idea of vertical stereographic sundial and it resulted in a paper describing several stereographic sundial types: - vertical stereographic sundial, for walls of any declination and for any latitude, - four-sided stereographic vertical sundial, attractive for its “gnomon-less” form, - double – stereographic & polar – vertical sundial for walls of any declination, a vertical reference to Oughtred’s horizontal design, - folded pocket, double stereographic & polar – vertical sundial - inclined, proclined and polyhedral stereographic sundials The paper can be downloaded free of charge from Cursiva publishers website: http://cursiva.pl/e-ksiegarnia/vertical-stereographic-sundial-properties-construction-and-related-instruments/ or from Academia.edu website: https://www.academia.edu/88820719/Vertical_stereographic_sundial_Properties_construction_and_related_instruments Have fun with it ! Vertical stereographic sundials offer plenty of possibilities for sundial makers and I believe might be a very interesting addition to existing sundial types. As the geometric construction of vertical stereographic sundials with CAD software is time-consuming, it would be great to include it in existing sundial design software. I kindly ask sundial list members running such software, please consider it ! Regards, Maciej Lose --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial
