Sunspot drawing of 2019-7-20

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https://doi.org/10.7891/e-manuscripta-160564



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2019-07-20
08:30
Hs 1304.6:11577
https://doi.org/10.7891/e-manuscripta-160564
Observer : Marco Cagnotti
Seeing (SIDC) : 3
No group