Sunspot drawing of 1973-2-21

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https://doi.org/10.7891/e-manuscripta-97442



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1973-02-21
10:30
Hs 1304.5:4989
https://doi.org/10.7891/e-manuscripta-97442
Observer : Sergio Cortesi
Seeing (SIDC) : 3
Group Not Weighted Weighted Type Latitude Carrington Longit.
46 8 C -16.5 305.2
55 10 C -16.1 260.6
57 5 A -19.4 181.6
3 23