Sunspot drawing of 2018-12-31

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https://doi.org/10.7891/e-manuscripta-160112



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2018-12-31
09:00
Hs 1304.6:11403
https://doi.org/10.7891/e-manuscripta-160112
Observer : Sergio Cortesi
Seeing (SIDC) : 2
No group