Sunspot drawing of 2019-8-31

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https://doi.org/10.7891/e-manuscripta-160425



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2019-08-31
08:15
Hs 1304.6:11614
https://doi.org/10.7891/e-manuscripta-160425
Observer : Marco Cagnotti
Seeing (SIDC) : 3
No group