Sunspot drawing of 1987-3-21

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https://doi.org/10.7891/e-manuscripta-142832



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1987-03-21
09:00
Hs 1304.6:1858
https://doi.org/10.7891/e-manuscripta-142832
Observer : Sergio Cortesi
Seeing (SIDC) : 3
Group Not Weighted Weighted Type Latitude Carrington Longit.
20 13 16 B 24 78
1 13 16