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Large Sunspots

Nature volume 143, page 717 (29 April 1939) | Download Citation

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Abstract

Two new large groups of sunspots have recently appeared. Particulars from the Royal Observatory, Greenwich, are as follows, the areas being measured on April 21 and expressed in millionths of the sun's visible hemisphere.

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DOI

https://doi.org/10.1038/143717f0

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