Sunspots minimum minimum. Robert Zimmerman

Dec 13, 2019, 01:08 AM
Image: NASA sunspots  photo.
Robert Zimmerman, BehindtheBlack.com, in re: Sunspots missing*.   https://behindtheblack.com/?s=sunspots
..
* 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.