Sunspot drawing of 1975-3-20

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https://doi.org/10.7891/e-manuscripta-98224



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1975-03-20
10:45
Hs 1304.5:5632
https://doi.org/10.7891/e-manuscripta-98224
Observer : Sergio Cortesi
Seeing (SIDC) : 3
Group Not Weighted Weighted Type Latitude Carrington Longit.
30 4 B -14.4 50.7
31 3 B 5.4 33.0
2 7