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I'm assuming it's a standard webcam set-up, no long exposure mods. The dark bands at the edges... maybe due to registration between the images, but I still see a "dark" frame of hot pixels which have now been added to make them brighter!!! Take a proper dark frame ( cover the lens) and see if it looks similar. When this is subtracted from your exposure, what ever is left should be an image of the sky.
I think the std webcam is very limited for general sky shots, maybe someone else can comment.
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