Sunspot drawing of 2018-9-20

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https://doi.org/10.7891/e-manuscripta-160129



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2018-09-20
07:45
Hs 1304.6:11331
https://doi.org/10.7891/e-manuscripta-160129
Observer : Marco Cagnotti
Seeing (SIDC) : 3
No group