Sunspot drawing of 2019-9-9

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https://doi.org/10.7891/e-manuscripta-160482



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2019-09-09
07:30
Hs 1304.6:11622
https://doi.org/10.7891/e-manuscripta-160482
Observer : Marco Cagnotti
Seeing (SIDC) : 3
No group