Sunspot drawing of 2017-2-20

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https://doi.org/10.7891/e-manuscripta-159420



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2017-02-20
08:45
Hs 1304.6:10862
https://doi.org/10.7891/e-manuscripta-159420
Observer : Marco Cagnotti
Seeing (SIDC) : 3
Group Not Weighted Weighted Type Latitude Carrington Longit.
15 1 1 A 10.7 182.0
16 1 2 A -3.6 123.9
17 3 4 C 21.1 110.7
18 1 3 J 17.1 106.1
4 6 10