Sunspot drawing of 2019-12-4

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https://doi.org/10.7891/e-manuscripta-160562



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2019-12-04
09:00
Hs 1304.6:11677
https://doi.org/10.7891/e-manuscripta-160562
Observer : Marco Cagnotti
Seeing (SIDC) : 4
No group