It's not often I'm in a position to get a photograph of the sunrise, and even rarer when I can do that from an aircraft in flight. My most recent opportunity came up in November 2011, somewhere in the air between Fredericton and Toronto. As I recall, the horizon presented itself as a rainbow band for what felt like half the flight, until the sunrise finally caught up with the west-speeding plane. Except for the lack of any curvature, it almost looks to me like the sort of photo you'd expect to see taken from orbit.
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