Sunspot drawing of 2018-7-28

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https://doi.org/10.7891/e-manuscripta-160043



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2018-07-28
08:00
Hs 1304.6:11282
https://doi.org/10.7891/e-manuscripta-160043
Observer : Marco Cagnotti
Seeing (SIDC) : 3
No group