Sunspot drawing of 2019-9-28

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https://doi.org/10.7891/e-manuscripta-160455



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2019-09-28
08:30
Hs 1304.6:11640
https://doi.org/10.7891/e-manuscripta-160455
Observer : Sergio Cortesi
Seeing (SIDC) : 3
No group