Sunspot drawing of 2018-2-21

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https://doi.org/10.7891/e-manuscripta-160037



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2018-02-21
09:30
Hs 1304.6:11157
https://doi.org/10.7891/e-manuscripta-160037
Observer : Marco Cagnotti
Seeing (SIDC) : 4
No group