Sunspot drawing of 2017-11-21

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https://doi.org/10.7891/e-manuscripta-159619



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2017-11-21
08:45
Hs 1304.6:11096
https://doi.org/10.7891/e-manuscripta-159619
Observer : Marco Cagnotti
Seeing (SIDC) : 3
No group