Sunspot drawing of 2018-9-18

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https://doi.org/10.7891/e-manuscripta-160047



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2018-09-18
08:30
Hs 1304.6:11329
https://doi.org/10.7891/e-manuscripta-160047
Observer : Marco Cagnotti
Seeing (SIDC) : 2
No group