Sunspot drawing of 2018-4-21

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https://doi.org/10.7891/e-manuscripta-160016
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2018-04-21
08:00
Hs 1304.6:11195
https://doi.org/10.7891/e-manuscripta-160016
Observer : Marco Cagnotti
Seeing (SIDC) : 4
Group Not Weighted Weighted Type Latitude Carrington Longit.
9 9 14 D 2.9 281.0
10 9 3 B -9.2 294.3
2 18 17