Sunspot drawing of 1975-4-28

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https://doi.org/10.7891/e-manuscripta-98217



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1975-04-28
06:30
Hs 1304.5:5664
https://doi.org/10.7891/e-manuscripta-98217
Observer : Sergio Cortesi
Seeing (SIDC) : 4
Group Not Weighted Weighted Type Latitude Carrington Longit.
39 8 B 0.7 124.9
40 8 C 8.3 230.4
2 16