Posted by Dennis Leahy
(here)
Posted by RMorgan
(here)
Posted by Dennis Leahy
(here)
... I don't believe a shadow can be cast onto blue sky...
It´s not a matter of belief, Dennis. It simply can...Well, not in the sky itself, because the very word sky is relative and subjective, but in the atmosphere, which has volume and a billion kinds of suspended particles.
Clouds, trails or anything else between the sun and your point of view will cast shadows.
...
will cast shadows ONTO [________________] <-- something of substance, not blue sky
Hi Raf,
As an amateur photographer, I have photographed the sky thousands of times, and have looked at many thousands more in magazines such as "Outdoor Photographer." As someone who has spent a lot of time outdoors, I can't even guess how many times I have seen blue skies. I have seen clouds cast shadows on clouds and on the ground. I have never seen a shadow "in the clear blue sky."
You need a "screen", an object, or something of substance to cast a shadow
upon.
There are two pilots in my extended family, so I'll add that I have never seen a shadow cast from a contrail or aerobatic smoke, cast onto the blue sky either.
I have also spent hundreds of hours in 3D animation software, learning about all of the types of lighting and how to deliberately cast shadows (for realism.)
Again, if there is enough crap/pollutants in the sky to turn it from "blue" to "hazy", then I think it is feasible. However... in addition to the hazy non-blue sky conditions, the sun would need to be very low in the sky, behind the plane of the observer, to cast any visible shadow onto anything of substance in the sky (such as a cloud.)
I have a bad habit of sounding dogmatic, and over the years I have made my words more gentle and less dogmatic by using phrases such as "it seems..." and "I believe..." but in this case, I'll go ahead and be dogmatic and state that it is impossible to cast a shadow onto a normal blue sky. ("Blue sky" indicating that there is nothing of substance upon which a shadow could be cast - and I use the word "normal" to indicate the sky as it was for the first 40 years of my life, when no contrail or cloud or bird or jet could ever cast a shadow onto the "empty" blue sky (which even included some industrial pollutants.)
Dennis