Sunspot drawing of 2019-9-20

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https://doi.org/10.7891/e-manuscripta-160421



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2019-09-20
08:15
Hs 1304.6:11633
https://doi.org/10.7891/e-manuscripta-160421
Observer : Marco Cagnotti
Seeing (SIDC) : 1
No group