"The Maunder Minimum, also known as the "prolonged sunspot minimum", is the name used for the period around 1645 to 1715 during which sunspots became exceedingly rare, as was then noted by solar observers."
27 posted on 11/04/2018 3:12:01 PM PST by Windflier
(Pitchforks and torches ripen on the vine. Left too long, they become black rifles.)