Sunspot drawing of 2016-12-23

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https://doi.org/10.7891/e-manuscripta-159246



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2016-12-23
08:15
Hs 1304.6:10820
https://doi.org/10.7891/e-manuscripta-159246
Observer : Marco Cagnotti
Seeing (SIDC) : 1
No group