Sunspot drawing of 2017-7-19

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https://doi.org/10.7891/e-manuscripta-159473



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2017-07-19
08:00
Hs 1304.6:10988
https://doi.org/10.7891/e-manuscripta-159473
Observer : Marco Cagnotti
Seeing (SIDC) : 3
No group