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On 12th September the late twilight showed a weak but distinctive purple arch due to scattering from particles very high in the atmosphere. |
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On the 14th it was even more prominent with a delicate lilac tint towards the end of main twilight. |
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By the 17th the sunset showed nothing unusual. |
Canon EOS 20D 12th, 14th and 17th September 2009
Wiltshire, England
