Sunspot drawing of 2017-4-21

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https://doi.org/10.7891/e-manuscripta-159646



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2017-04-21
08:15
Hs 1304.6:10913
https://doi.org/10.7891/e-manuscripta-159646
Observer : Marco Cagnotti
Seeing (SIDC) : 3
Group Not Weighted Weighted Type Latitude Carrington Longit.
33 8 13 D 11.9 69.9
34 1 2 A 13.0 55.6
35 1 3 J -8.8 24.0
3 10 18