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WASHINGTON, DC - DECEMBER 22; A jet leaves a long contrail in the... News PhotoHuman Interest,Morning,Panoramic,Sky,USA,Vapor Trail,Vertical,Washington DCPhotographer Collection: The Washington Post 2011 The Washington PostWASHINGTON, DC - DECEMBER 22; A jet leaves a long contrail in the early morning sky above Washington, DC on Dec. 22. Today is the winter solstice -- the first day of winter and the day with the shortest amount of daylight of the year. (Photo by Bonnie Jo Mount/The Washington Post via Getty Images)