Sunspot drawing of 2017-12-29

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https://doi.org/10.7891/e-manuscripta-159536



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2017-12-29
10:00
Hs 1304.6:11122
https://doi.org/10.7891/e-manuscripta-159536
Observer : Marco Cagnotti
Seeing (SIDC) : 3
No group