Does anyone know where I can find information on the intensity and color 
of skylight as a function of solar elevation angle, including when the 
sun is below the horizon ? Needless to say this is highly variable 
depending on the amount of aerosols etc. but I'm looking for something 
fairly 'typical' (I'm assuming a clear sky, i.e. no clouds). I'm also 
interested in the overall contribution of skylight to a scene's 
brightness relative to sunlight.

-- 
Bjorn Jonsson
http://www.mmedia.is/bjj

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