Sunspot drawing of 1973-3-20

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https://doi.org/10.7891/e-manuscripta-97500



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1973-03-20
08:15
Hs 1304.5:5015
https://doi.org/10.7891/e-manuscripta-97500
Observer : Sergio Cortesi
Seeing (SIDC) : 4
Group Not Weighted Weighted Type Latitude Carrington Longit.
70 2 A -13.8 336.0
74 15 C 14.3 223.6
2 17