Sunspot drawing of 2016-4-20

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https://doi.org/10.7891/e-manuscripta-159228



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2016-04-20
08:00
Hs 1304.6:10628
https://doi.org/10.7891/e-manuscripta-159228
Observer : Sergio Cortesi
Seeing (SIDC) : 3
Group Not Weighted Weighted Type Latitude Carrington Longit.
87 3 5 C 5.1 238.1
88 1 3 J -2.7 181.4
2 4 8