Sunspot drawing of 2019-9-12

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https://doi.org/10.7891/e-manuscripta-160428



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2019-09-12
07:45
Hs 1304.6:11625
https://doi.org/10.7891/e-manuscripta-160428
Observer : Sergio Cortesi
Seeing (SIDC) : 4
No group