Hello! I've recently become interested in film photography. I think it has some similarities to sundials. For example, it is said that black and white film photography is about taking pictures not of actual subjects, but of light and shadows. I find it fascinating how light actually darkens the salts on the photographic material, like a gnomon does to the surface of a sundial. Not to mention the meridian lines in churches that also act like giant camera obscuras, projecting the solar disc image onto the pavement.
Now I've read that daylight color temperature fluctuates by the hour of the day: light in the early morning and late evening has under 5000 K, while around noon it reaches 6000 K and beyond . But can you actually use this intrinsic light quality for time telling i.e. design a color temperature sundial? Dan Uza Romania
--------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial
