Sunspot drawing of 2018-12-18

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https://doi.org/10.7891/e-manuscripta-160057



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2018-12-18
09:00
Hs 1304.6:11392
https://doi.org/10.7891/e-manuscripta-160057
Observer : Marco Cagnotti
Seeing (SIDC) : 3
No group