| http://www.w3.org/ns/prov#value | - The solar physicists (see e.g. Solanki et al., 2005) find the Maunder minimum to have been the period of least solar activity in the past 11,400 years, and there is a growing body of literature suggesting that the grand maximum of 1925-1995, centered on 1960, was also rare, if not unique, over the same timescale.
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