Sunspot drawing of 2018-4-20

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https://doi.org/10.7891/e-manuscripta-160029



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2018-04-20
08:00
Hs 1304.6:11194
https://doi.org/10.7891/e-manuscripta-160029
Observer : Sergio Cortesi
Seeing (SIDC) : 3
Group Not Weighted Weighted Type Latitude Carrington Longit.
9 4 8 D 3.1 279.9
1 4 8