TonyB wrote:
> 
> >Why is the sky blue?
> 
> Because the air refracts the sunlight, creating what we see as sky color.

This is not an effect of refraction but, if I remember right ,the colour
blue is in addition a polarisation effect while the "lightness" depends
on the scattering. The air molecules scatter the light. If you look up
then the effect is the smallest and the sky the more blueish. If you
look at the horizion the light has more atmospheric length to scatter so
that the sky shows more of a light blue there.

Marc 

-- 
Marc Schimmler

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