Sunspot drawing of 2017-9-21

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https://doi.org/10.7891/e-manuscripta-159401



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2017-09-21
07:45
Hs 1304.6:11042
https://doi.org/10.7891/e-manuscripta-159401
Observer : Marco Cagnotti
Seeing (SIDC) : 3
Group Not Weighted Weighted Type Latitude Carrington Longit.
78 1 3 J 7.7 317.9
79 1 3 J -14.7 177.5
2 2 6