Sunspot drawing of 2019-12-28

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https://doi.org/10.7891/e-manuscripta-160501



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2019-12-28
09:00
Hs 1304.6:11691
https://doi.org/10.7891/e-manuscripta-160501
Observer : Marco Cagnotti
Seeing (SIDC) : 1
No group