Hello Robert, the beautiful sundial in Englewood is a cylindrical "camera obscura" sundial ( or pin-hole s.) with a little hole in the center of the ceiling of the cylindrical room (the entrance of the School) and has a diameter of 1/8" (3mm). This kind of sundial can work only if the hole diameter is at laest 1/200-1/300 of the distance from it to the wall of the cylinder ( or smaller), so that the luminous spot is an image of the Sun. This is not true in Phanteon. Best Gianni F.
2009/2/4 Robert Terwilliger <[email protected]> > There is an interesting dial in the NASS Registry which has many > characteristics that might relate to the Pantheon as a sundial > > Go To: > > Colorado >scroll down to> Englewood #555 > http://sundials.org/registry/ > > Bob > > > > > --------------------------------------------------- > https://lists.uni-koeln.de/mailman/listinfo/sundial > > > -- Gianni Ferrari Mail to : [email protected]
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