On Thu, Jun 7, 2018 at 3:19 PM, Willy Leenders <willy.leend...@telenet.be> wrote:
> 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. > I agree. -Bill > > 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. > Yes, but in this case the ellipse appears elongated east-west, but it should be elongated north-south. I am guessing the low camera angle has created this illusion of east-west elongation. -Bill > > 3. > The inner circle indicates the right place, the outer circumference > corresponds to the circumference of the light spot on that moment > Not sure I understand this. -Bill > > 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 <jtallman@artisanindustrials. > com> 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 >> <http://www.spectrasundial.com/>www.spectrasundial.com >> <http://www.artisanindustrials.com/>www.artisanindustrials.com >> >> jtall...@artisanindustrials.com >> 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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