Sunspot drawing of 1977-4-21

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https://doi.org/10.7891/e-manuscripta-98879
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1977-04-21
08:00
Hs 1304.5:6271
https://doi.org/10.7891/e-manuscripta-98879
Observer : Araldo Pittini
Seeing (SIDC) : 3
Group Not Weighted Weighted Type Latitude Carrington Longit.
32 7 D -19.9 24.1
1 7