April 6th 2013
http://apod.nasa.gov/apod/ap130406.html
At twilight the earth is shown in this picture taken June 2001, as a smooth transition from day to night. This picture was taken from the international space station, and shows this clear transition. The red reflection is the light reflecting off of the earth's lowest layer, the troposphere. It was taken from an altitude of 211 nautical miles.
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