Sunspot drawing of 2017-12-28

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https://doi.org/10.7891/e-manuscripta-159554



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2017-12-28
09:00
Hs 1304.6:11121
https://doi.org/10.7891/e-manuscripta-159554
Observer : Marco Cagnotti
Seeing (SIDC) : 2
No group