Sunspot drawing of 2017-9-20

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https://doi.org/10.7891/e-manuscripta-159513



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2017-09-20
08:30
Hs 1304.6:11041
https://doi.org/10.7891/e-manuscripta-159513
Observer : Marco Cagnotti
Seeing (SIDC) : 3
Group Not Weighted Weighted Type Latitude Carrington Longit.
78 1 3 J 8.2 317.1
1 1 3