Sunspot drawing of 2016-12-16

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https://doi.org/10.7891/e-manuscripta-159066



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2016-12-16
08:30
Hs 1304.6:10815
https://doi.org/10.7891/e-manuscripta-159066
Observer : Marco Cagnotti
Seeing (SIDC) : 4
No group