Sunspot drawing of 1998-4-20

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https://doi.org/10.7891/e-manuscripta-150188



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1998-04-20
07:30
Hs 1304.6:5286
https://doi.org/10.7891/e-manuscripta-150188
Observer : Sergio Cortesi
Seeing (SIDC) : 4
Group Not Weighted Weighted Type Latitude Carrington Longit.
73 23 24 C 21 312
74 3 4 B 24 247
2 26 28