Xplo Eristotle wrote:
> 
> The reason the sky is brighter towards the horizon is the same reason
> that the sky is blue; ie, light scattering. Light that hits the
> atmosphere head-on doesn't get scattered much, since it has a minimal
> amount of atmosphere to pass through, so it's kind of like looking at
> space through a piece of glass. When it hits the atmosphere at an angle,
> though, it hits a lot more air particles and gets scattered a lot.
> 
> If you want to test this for yourself, go outside on a sunny day and
> look up.
> 
> The only reason the sky might appear brighter near the sun (at least,
> enough to matter) is if there was enough haze in the air to give the sun
> kind of a glare halo.. but this would be most apparent when the sun was
> low, again, because when it's high it doesn't have a lot of haze to go through.
> 

Some links for detailed explanation:

http://hyperphysics.phy-astr.gsu.edu/hbase/atmos/blusky.html
http://www.zenith9.demon.co.uk/pages/lab/bluesky.htm
http://www.isc.tamu.edu/~astro/dis/rayleigh/

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

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