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Orion Davidson | all galleries >> Other >> Article Graphics >> Energy and Global Warming >> GlobalWarmingGraphics >> Sunspots and Cycle 24 > GrandMinima_27_Dates.JPG
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07-NOV-2012

GrandMinima_27_Dates.JPG

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Ronald Gale Johnson14-Dec-2013 00:21
How do they determine the "grand minima?" I'm aware of the 11 year cycles but I'm not aware of this term. Thanks.