Sunspot drawing of 1974-4-21

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https://doi.org/10.7891/e-manuscripta-97855



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1974-04-21
07:15
Hs 1304.5:5349
https://doi.org/10.7891/e-manuscripta-97855
Observer : Sergio Cortesi
Seeing (SIDC) : 3
Group Not Weighted Weighted Type Latitude Carrington Longit.
47 13 D -13.3 125.8
48 9 C -9.0 120.5
50 7 B 2.0 103.2
51 2 B -8.0 348.6
4 31