See on my website: http://www.wijzerweb.be/analemmatischengels.html The maximum time (12 hours) of sunlight on a vertical wall of any direction is above the Arctic Circle on a day when the midnight sun shines
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 14-jun-2016, om 10:29 heeft Frank King het volgende geschreven: > Dear Dan, > > The approach that you describe does > indeed show you how long the sun can > theoretically shine on a vertical > wall, for a given solar declination, > provided (as you say) that you know > the times the sun rises and sets. > > Now a simple exercise... > > What is the maximum amount of time > the sun can shine on a vertical wall? > > You can choose the latitude and you > can choose the orientation of the > wall and you can choose the solar > declination. > > Frank King > Cambridge, U.K. > > --------------------------------------------------- > https://lists.uni-koeln.de/mailman/listinfo/sundial >
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