Abstract
RECENT NAKED-EYE SUNSPOTS.—The last naked-eye group of sunspots noted in these columns was No. 9, seen on the sun's central meridian on July 30. Another large group bordering on naked-eye visibility was in transit across the disc between August 10 and 22, but as some observers failed to see it, a number has not been assigned to it in our tabular list of these large spots. Since September 13, however, an important group has been an easy naked-eye object. This new group is composed of two very large spots, both of which could be seen separately through morning fog on September 18. On that clay their apparent separation was 3½′, corresponding to 14½° of solar longitude between their respective centres.
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Our Astronomical Column. Nature 118, 459 (1926). https://doi.org/10.1038/118459a0
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DOI: https://doi.org/10.1038/118459a0