You are forgetting the case of when the sun is behind light clouds (which is not everywhere, but definitely does happen): http://slideviewer.appspot.com/show?t

You are forgetting the case of when the sun is behind light clouds (which is not everywhere, but definitely does happen): http://slideviewer.appspot.com/show?tag=dgay,solar-eclipse,1999&offset=1 http://slideviewer.appspot.com/show?tag=dgay,solar-eclipse,1... (no filter)