Sunspot drawing of 2018-7-21

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https://doi.org/10.7891/e-manuscripta-159984



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2018-07-21
07:00
Hs 1304.6:11275
https://doi.org/10.7891/e-manuscripta-159984
Observer : Marco Cagnotti
Seeing (SIDC) : 2
No group