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which is the shortest day in 2012?
Friday, Dec. 21, the sun will appear to make its lowest, quickest trek across the sky all year, resulting in the shortest day of 2012 and the official start of winter. Earth is tilted on its axis 23.5 degrees, so it leans one way as it spins around its axis while orbiting the sun. On Dec. 21, the top half of the planet (everything north of the equator) will face away from the sun, leaving the North Pole in complete darkness.


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