Sunspot drawing of 1977-4-20

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https://doi.org/10.7891/e-manuscripta-98799



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1977-04-20
06:00
Hs 1304.5:6270
https://doi.org/10.7891/e-manuscripta-98799
Observer : Araldo Pittini
Seeing (SIDC) : 3
Group Not Weighted Weighted Type Latitude Carrington Longit.
32 9 D -20.2 24.6
1 9