Abstract
FOR the third time during September, a large naked-eye sunspot group has occurred. The last of these is a giant single spot crossing the disk between September 22 and October 4 with central meridian passage on September 28·0. Near the east limb the spot had an area corrected for foreshortening of more than 1,500 millionths of the sun's visible hemisphere. This spot is the return of an even larger spot (NATURE, Sept. 16, p. 508) which crossed the disk between August 26 and September 7.
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A Big Sunspot. Nature 144, 591 (1939). https://doi.org/10.1038/144591d0
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DOI: https://doi.org/10.1038/144591d0