Sunspot drawing of 2017-12-20

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https://doi.org/10.7891/e-manuscripta-159562



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2017-12-20
09:15
Hs 1304.6:11116
https://doi.org/10.7891/e-manuscripta-159562
Observer : Marco Cagnotti
Seeing (SIDC) : 3
Group Not Weighted Weighted Type Latitude Carrington Longit.
93 2 3 A 18.4 86.0
1 2 3