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In this composite image, the sun has reached its northernmost point in Earth's sky, marking a season change and the first solstice of the year 2004.
December 22, 2015 If you don't know why Earth has a solstice — or seasons, for that matter — you are in good company, says astrophysicist Adam Frank. But he's going to clear it up for you.
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A replica Mayan Calendar Round showing the date September 21, 2004, opening day for the Smithsonian's National Museum of the American Indian.
Molly Stephey/Smithsonian's National Museum of the American Indian
December 19, 2012 According to millions of people, the world will end this Friday. Commentator Marcelo Gleiser debunks the doomsday prophecy and reflects on why so many otherwise reasonable people fall prey to such ancient fears.
Newgrange: A monument to the winter solstice.
German Poo-Caamano/via Flickr
December 21, 2010 Why do we celebrate Christmas just a few days after the winter solstice when almost no one thinks Jesus was born on December 25th?
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