Sunspot drawing of 1998-4-21

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https://doi.org/10.7891/e-manuscripta-150174



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1998-04-21
08:00
Hs 1304.6:5287
https://doi.org/10.7891/e-manuscripta-150174
Observer : Sergio Cortesi
Seeing (SIDC) : 4
Group Not Weighted Weighted Type Latitude Carrington Longit.
73 17 26 D 21 312
74 1 2 A 23 247
75 2 2 A 0 270
3 20 30