Sunspot drawing of 2019-12-7

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https://doi.org/10.7891/e-manuscripta-160440



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2019-12-07
08:45
Hs 1304.6:11680
https://doi.org/10.7891/e-manuscripta-160440
Observer : Marco Cagnotti
Seeing (SIDC) : 2
No group