GeoEye-1 shot this photo on April 4, 2009 from a height of 423 miles, as the spacecraft moved from north to south along the eastern seaboard of the U.S.
Note the pretty cherry trees along the tidal basin.Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.


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Can anyone tell me the time of day that the image was taken?
The Washington Monument makes a fantastic sundial, it's almost a shame the builders didn't insinuate analematic features into the monument-scape of the Mall.
probably early afternoon judging by the shadow of the Washington monument.
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