On Mon, 31 Oct 2005 10:16:07 -0800, Jim Kelley
wrote:

On all but the smallest of scales, the sky is quite uniform in its
luminosity. It can hardly be described as a "collapsing sphere"; not
even from the point of view of a geocentric model of the universe.

Hi Jim,

Perhaps not, but "quite uniform" is rather in the eye of the beholder.
When I take panagraphic photographs (a broad scale), it is quite
evident that the uniformity is not very uniform. Another variable is
that polarization is not very uniform either (which, photographically
may be saying the same thing).

The eye is a wonderful device, but not very precise.

73's
Richard Clark, KB7QHC