Gianni,The image displayed at http://www.museogalileo.it/esplora/itinerari/itinerarituristicoculturali/lineasolemeridianefirenze.html is a wonderful 3D reconstruction. The give-away is no penumbral shadows. But it is marvelous. Who created it and what is the story of how it came into being? Was this a Blender project?
Bob Kellogg --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial
