Sunspot drawing of 2016-4-21

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https://doi.org/10.7891/e-manuscripta-159042



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2016-04-21
09:00
Hs 1304.6:10629
https://doi.org/10.7891/e-manuscripta-159042
Observer : Sergio Cortesi
Seeing (SIDC) : 3
Group Not Weighted Weighted Type Latitude Carrington Longit.
87 4 5 C 4.9 239.8
88 1 3 J -1.8 182.0
2 5 8