Sunspot drawing of 2019-9-21

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https://doi.org/10.7891/e-manuscripta-160565



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2019-09-21
08:45
Hs 1304.6:11634
https://doi.org/10.7891/e-manuscripta-160565
Observer : Marco Cagnotti
Seeing (SIDC) : 4
No group