Abstract
Two very large groups of sunspots have recently appeared. The first of these was a big single spot with companions increasing in size; the second group comprised a complex stream. Positions and areas are as follows:
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Recent Sunspots. Nature 144, 508 (1939). https://doi.org/10.1038/144508b0
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DOI: https://doi.org/10.1038/144508b0