Sunspot drawing of 2019-9-10

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https://doi.org/10.7891/e-manuscripta-160454



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2019-09-10
07:15
Hs 1304.6:11623
https://doi.org/10.7891/e-manuscripta-160454
Observer : Marco Cagnotti
Seeing (SIDC) : 3
No group