Sunspot drawing of 2017-10-17

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https://doi.org/10.7891/e-manuscripta-159663



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2017-10-17
07:30
Hs 1304.6:11065
https://doi.org/10.7891/e-manuscripta-159663
Observer : Marco Cagnotti
Seeing (SIDC) : 4
No group