Sunspot drawing of 2019-9-11

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https://doi.org/10.7891/e-manuscripta-160594



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2019-09-11
08:00
Hs 1304.6:11624
https://doi.org/10.7891/e-manuscripta-160594
Observer : Marco Cagnotti
Seeing (SIDC) : 4
No group