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A perigee moon is when the moon is at its closest to the earth. This phenomenon has occured three times this year.

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Setting sun illuminates cumulus clouds as full moon rises in Apfeltrang, southern Germany,.KARL-JOSEF HILDENBRAND/AFP / Getty Images

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The full moon behind a cross on a church in Minsk. also known as a Harvest Moon, is the third and final "supermoon" of 2014. The phenomenon, which scientists call a "perigee moon," occurs when the moon is near the horizon and appears larger and brighter than other full moons.MAXIM MALINOVSKY/AFP / Getty Images

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The full moon silhouettes the statue of the Virgin Mary on top the University of Notre Dame's golden dome in South Bend, Ind.Robert Franklin/The Associated Press

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Visitors to The London Eye ferris wheel view the near full moon in Whitehall in London, England.Peter Macdiarmid/Getty Images

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Queen's University student Lindsay Meier takes a picture of the full moon as it rises over Lake Ontario in Kingston, Ont.Lars Hagberg/The Canadian Press

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A full moon rises past thunder clouds near Encinitas, California.MIKE BLAKE/Reuters

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A couple sits on a bluff overlooking the Missouri River as the full moon rises in the distance Kansas City, Mo.Charlie Riedel/The Associated Press

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A full moon rises over a horse pasture in Halton Hills, Ontario outside Toronto.HYUNGWON KANG/Reuters

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The moon rises with an orange glow as people watch from a rock cliff at Bondi Beach in Sydney.Rick Rycroft/The Associated Press

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The moon rises with an orange glow as people watch from a rock cliff at Bondi Beach in Sydney.Rick Rycroft/The Associated Press

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