Sunspot drawing of 1973-2-20

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https://doi.org/10.7891/e-manuscripta-97337



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1973-02-20
08:00
Hs 1304.5:4988
https://doi.org/10.7891/e-manuscripta-97337
Observer : Sergio Cortesi
Seeing (SIDC) : 3
Group Not Weighted Weighted Type Latitude Carrington Longit.
46 9 D -16.5 305.9
55 8 B -16.1 261.5
56 3 A 8.4 330.3
3 20