Am 15.06.2012 14:52, schrieb Le_Forgeron:

> IIRC, the blue of the sky is due to the variant IOR (vs void) of the
> atmosphere for the "white" light: the blue is turned more toward the
> earth (well, sooner: it might explains a bit the redish-moon eclipse).

Not really; the dispersion (wavelength-dependency of IOR) of the 
atmosphere in the visible light spectrum is rather low. But the gases in 
the atmosphere scatter a certain portion of the sunlight's photons, and 
at the blue end of the visible spectrum this portion is bigger than at 
the red end.

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