The photographer must chosen in advance to take such a picture, and chosen the right time for the picture.
Michael Ossipoff On Tue, Dec 1, 2015 at 9:11 AM, Dave Bell <db...@thebells.net> wrote: > Yes, the surprise is not so much that it happened, but that the > photographer was there at the one(?) precise date and time. > > Like a stopped clock, it’s precisely correct, once each period! > > Makes a great picture, regardless. > > > > Dave > > > ------------------------------ > > *From:* sundial [mailto:sundial-boun...@uni-koeln.de] *On Behalf Of *Jackie > Jones > *Sent:* Tuesday, December 01, 2015 4:48 AM > *To:* 'Dan-George Uza'; sundial@uni-koeln.de > *Subject:* RE: Just the right spot and time! > > > > I would have thought it should be very simple and not a freak. As long as > the sides of the post are parallel to the paving slabs and the sun is > exactly south (or north if you are in the southern hemisphere), at twice a > year this should be the result. The dates would depend on the height of > the post. Although, I think it should work even if it isn’t due south, > just when the sun is directly behind the post and the right height. > > Jackie > > > > Jackie Jones > > 50° 50’ 09” N 0° 07’ 40” W > > > > > > > > > > > > *From:* sundial [mailto:sundial-boun...@uni-koeln.de] *On Behalf Of > *Dan-George > Uza > *Sent:* 01 December 2015 11:36 > *To:* sundial@uni-koeln.de > *Subject:* Just the right spot and time! > > > > Hello, > > > > This freak shadow alignment is featured on ASAP Science's Facebook page. > The question is how to design something similar. Anybody? > > > > Dan Uza > > > > --------------------------------------------------- > https://lists.uni-koeln.de/mailman/listinfo/sundial > > >
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