Sunspot drawing of 2018-9-22

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https://doi.org/10.7891/e-manuscripta-160028



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2018-09-22
07:15
Hs 1304.6:11333
https://doi.org/10.7891/e-manuscripta-160028
Observer : Marco Cagnotti
Seeing (SIDC) : 3
No group