Sunspot drawing of 2016-12-21

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https://doi.org/10.7891/e-manuscripta-159269



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2016-12-21
09:45
Hs 1304.6:10818
https://doi.org/10.7891/e-manuscripta-159269
Observer : Marco Cagnotti
Seeing (SIDC) : 3
Group Not Weighted Weighted Type Latitude Carrington Longit.
217 10 11 C -23.1 305.1
218 5 5 B -6.2 251.6
2 15 16