Sunspot drawing of 2017-1-20

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https://doi.org/10.7891/e-manuscripta-159563



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2017-01-20
08:30
Hs 1304.6:10844
https://doi.org/10.7891/e-manuscripta-159563
Observer : Marco Cagnotti
Seeing (SIDC) : 3
Group Not Weighted Weighted Type Latitude Carrington Longit.
2 2 4 J 0 253.8
3 3 6 C 7.4 242.9
6 5 7 B 5.2 190.3
7 2 3 B 11.6 169.7
4 12 20