Abstract
Several notable solar‐terrestrial anniversaries occur between 2008 and 2010. The oldest is the 400‐year anniversary of Galileo Galilei's study of sunspots in 1610. Very large sunspots had been seen without telescopes centuries before Galileo, but his observations started a line of solar research that, among other things, led to the discovery of the Maunder Minimum, a period of extremely low solar activity, from 1645 to 1715, in which sunspots became very rare.
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