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--- Begin Message ---Aren't we in danger here of confusing 'light' and 'source of light'? The light from the sun, for instance, is traveling away from the sun - toward a dial surface, for example. The shadow from an object is also pointing away from the sun - toward the dial surface for example, if from the gnomon. You could interpret that as 'being in the same direction'. Rudolf, 52 30 N 4 40 E -----Oorspronkelijk bericht----- Van: sundial <sundial-boun...@uni-koeln.de> Namens Frank King Verzonden: maandag 11 maart 2024 10:02 Aan: Sundial List <sundial@uni-koeln.de> Onderwerp: Photograph of the Princess of Wales Dear All, There is much talk about the recent photograph of the Princess of Wales and her children. In one newspaper I read that "a former digital forensics officer for Dorset Police said... 'In a true image, the shadows will all be in the same direction as the light'" Huh! He has clearly never looked at a sundial! He may mean 'in the opposite direction' but that isn't true either. Moreover, shadows do not necessarily align. A Double Horizontal sundial works precisely because its two shaodws are (generally)in different directions. Of course, a shadow CAN be in the same direcion as the light. I'll leave that as an exercise for the reader :-) Frank King Cambridge, UK --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial
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