Is this real or a concept? The shadows don’t move in the rest of the image. - Bill
On Sun, Oct 30, 2022 at 7:14 AM Alexei Pace <alexei.p...@gmail.com> wrote: > Interesting one in Rue Montmartre > https://www.instagram.com/reel/Cj0hS2JIPQV/?igshid=YmMyMTA2M2Y= > > On Wed, Oct 26, 2022, 11:58 Werner Riegler <werner.rieg...@cern.ch> wrote: > >> Dear John, >> >> I know this object as “Horizontoscope". >> http://www.horizontoscop.com/eng/index_eng.html >> >> I bought one recently after reading about it in one of Helmut >> Sonderegger’s articles, where he gives the math of it. >> >> https://www.herzog-forsttechnik.ch/wp-content/uploads/2022/08/Sonnenkompass_Flyer-2022.pdf >> >> It’s quite interesting how the hyperbolic surface makes the image >> independent of the height between the observing eye and the device. >> >> There is a german wikipedia entry. >> https://de.wikipedia.org/wiki/Horizontoskop >> >> Maybe someone from the sundial list can produce an english entry with the >> theory. It’s a nice device ! >> >> best regards >> Werner >> >> >> >> >> >> On 26 Oct 2022, at 02:45, John Pickard <john.pick...@bigpond.com> wrote: >> >> Good morning, >> >> Has anyone come across this dial-related device? >> >> >> https://picclick.co.uk/ARCHITECT-TOOL-Window-SUNLIGHT-SUN-ELEVATION-Enraf-144741549298.html >> >> Cheers, John. >> >> Dr John Pickard. >> >> --------------------------------------------------- >> https://lists.uni-koeln.de/mailman/listinfo/sundial >> >> >> --------------------------------------------------- >> https://lists.uni-koeln.de/mailman/listinfo/sundial >> >> --------------------------------------------------- > https://lists.uni-koeln.de/mailman/listinfo/sundial > >
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