Sunspot drawing of 2017-12-15

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https://doi.org/10.7891/e-manuscripta-159526



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2017-12-15
10:00
Hs 1304.6:11112
https://doi.org/10.7891/e-manuscripta-159526
Observer : Marco Cagnotti
Seeing (SIDC) : 2
No group