Sunspot drawing of 2018-2-20

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https://doi.org/10.7891/e-manuscripta-160004



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2018-02-20
09:15
Hs 1304.6:11156
https://doi.org/10.7891/e-manuscripta-160004
Observer : Marco Cagnotti
Seeing (SIDC) : 2
No group