Sunspot drawing of 2017-7-28

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https://doi.org/10.7891/e-manuscripta-159656



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2017-07-28
07:45
Hs 1304.6:10997
https://doi.org/10.7891/e-manuscripta-159656
Observer : Sergio Cortesi
Seeing (SIDC) : 3
Group Not Weighted Weighted Type Latitude Carrington Longit.
61 2 2 B 18.3 252.5
1 2 2