NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Frank Reed
Date: 2013 Aug 14, 17:23 -0700
I would say it's almost certainly a shadow. Most likely there was a nice dense cloud out there blocking the direct Sun towards the right.
Have you ever seen the Earth's shadow on the sky towards the east when the Sun is maybe 5 to 10 degrees below the horizon? That's what first popped into my head when I saw the subject "two-tone sky". There's a nice dark band above the horizon and then a rather sharp transition to a brighter zone where the higher atmosphere is still illuminated by the Sun below the local horizon in the west.
-FER
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