Sunspot drawing of 2017-8-20

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https://doi.org/10.7891/e-manuscripta-159531



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2017-08-20
08:00
Hs 1304.6:11015
https://doi.org/10.7891/e-manuscripta-159531
Observer : Andrea Manna
Seeing (SIDC) : 3
Group Not Weighted Weighted Type Latitude Carrington Longit.
65 19 26 D 10.1 311.6
66 21 25 E 10.9 299.3
67 1 3 J 4.3 228.0
3 41 54