Sunspot drawing of 2017-4-20

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https://doi.org/10.7891/e-manuscripta-159520



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2017-04-20
08:15
Hs 1304.6:10912
https://doi.org/10.7891/e-manuscripta-159520
Observer : Marco Cagnotti
Seeing (SIDC) : 2
Group Not Weighted Weighted Type Latitude Carrington Longit.
33 5 12 D 11.7 70.0
34 1 2 A 13.1 54.5
2 6 14