As the sun nears the horizon the light passes through a much greater distance in the atmosphere.
This increases the amount of blue light that is scattered out of the beam by molecules in the air.
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With the sun almost 10 degrees above the horizon this cumulus cloud rising into clear air appears clean and white.
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Two hours later the sun is more than a degree below the local horizon.
This cumulus cloud is now catching sunlight that is heavily reddened by the much longer passage through the atmosphere.
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Canon EOS 5D 10th April 2012
Wiltshire, England