Abstract
A CONSPICUOUS feature of present solar activity is the appearance on the disk at the same time of three large sunspots, each being visible to the naked eye. Foggy weather in London and elsewhere on November 28 provided almost ideal conditions for direct observation without a telescope, and a number of people, who were previously quite unaware of the existence of the spots, discovered them independently for themselves. From a photograph obtained at the Royal Observatory, Greenwich, on November 27, the following data are derived:
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Three Large Sunspots. Nature 138, 965 (1936). https://doi.org/10.1038/138965d0
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DOI: https://doi.org/10.1038/138965d0