Sunspot drawing of 2019-9-4

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https://doi.org/10.7891/e-manuscripta-160548



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2019-09-04
08:30
Hs 1304.6:11618
https://doi.org/10.7891/e-manuscripta-160548
Observer : Marco Cagnotti
Seeing (SIDC) : 4
No group