Sunspot drawing of 1987-4-21

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https://doi.org/10.7891/e-manuscripta-142917



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1987-04-21
07:30
Hs 1304.6:1884
https://doi.org/10.7891/e-manuscripta-142917
Observer : Sergio Cortesi
Seeing (SIDC) : 2
Group Not Weighted Weighted Type Latitude Carrington Longit.
37 4 6 B -25 2
1 4 6