Abstract
A LARGE sunspot appeared over the sun's east limb on October 19 and is now crossing to the west limb, which it will reach on November 1. The time of central meridian passage of the spot is October 26·0, its latitude 8° south and its area, corrected for foreshortening, on October 20, was 1850 millionths of the sun's hemisphere.
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A Large Sunspot. Nature 144, 748 (1939). https://doi.org/10.1038/144748e0
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DOI: https://doi.org/10.1038/144748e0