Hi Bill, My answers on your questions are:
1. The light spot moves from the west to the east and the camera observes this from a position north of that displacement 2. The image of a circle projected by the sun is only a circle in an exceptional case. In all other cases it is an ellipse. 3. The inner circle indicates the right place, the outer circumference corresponds to the circumference of the light spot on that moment Willy Leenders Hasselt in Flanders (Belgium) Visit my website about the sundials in the province of Limburg (Flanders) with a section 'worth knowing about sundials' (mostly in Dutch): http://www.wijzerweb.be Op 7-jun-2018, om 19:51 heeft Bill Gottesman het volgende geschreven: > Thought provoking video. Here are a two simple questions worth contemplating: > > 1. From what perspective is the video filmed?Is the camera roughly south, > north, east,or west of the summer solstice mark? > > 2. Why does the sun appear elongated in its right-to-left direction of > travel across the screen? Is this at all surprising? > > And a hard one, the answer to which I am unsure: > 3. What is the purpose of constructing the smaller circle (or ellipse) > inside of the larger one? > > -Bill > > On Thu, Jun 7, 2018 at 7:38 AM, J. Tallman <[email protected]> > wrote: > Hello All, > > This morning I saw an article online about the upcoming summer solstice that > may be of interest: > > https://www.thelocal.it/20180606/florence-duomo-gnomon-summer-solstice > > Get your sundial prototypes ready to test, it won't be long before the > special moment comes! > > > Best, > > Jim Tallman > www.spectrasundial.com > www.artisanindustrials.com > > [email protected] > 513-253-5497 > > This message is being sent remotely as I am currently out of the studio. > Please excuse any further delay in response. > > --------------------------------------------------- > https://lists.uni-koeln.de/mailman/listinfo/sundial > > > > --------------------------------------------------- > https://lists.uni-koeln.de/mailman/listinfo/sundial > Willy Leenders Hasselt in Flanders (Belgium) Visit my website about the sundials in the province of Limburg (Flanders) with a section 'worth knowing about sundials' (mostly in Dutch): http://www.wijzerweb.be
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