Sunspot drawing of 2019-9-18

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https://doi.org/10.7891/e-manuscripta-160518



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2019-09-18
07:15
Hs 1304.6:11631
https://doi.org/10.7891/e-manuscripta-160518
Observer : Marco Cagnotti
Seeing (SIDC) : 3
No group