Sunspot drawing of 2019-2-18

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https://doi.org/10.7891/e-manuscripta-160470



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2019-02-18
08:30
Hs 1304.6:11443
https://doi.org/10.7891/e-manuscripta-160470
Observer : Marco Cagnotti
Seeing (SIDC) : 4
No group