Sunspot drawing of 2017-8-21

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https://doi.org/10.7891/e-manuscripta-159608



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2017-08-21
08:15
Hs 1304.6:11016
https://doi.org/10.7891/e-manuscripta-159608
Observer : Marco Cagnotti
Seeing (SIDC) : 3
Group Not Weighted Weighted Type Latitude Carrington Longit.
65 10 15 D 10.5 312.6
66 13 20 D 10.8 300.1
67 7 13 D 6.9 226.0
3 30 48