Sunspot drawing of 2019-4-30

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https://doi.org/10.7891/e-manuscripta-160662



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2019-04-30
08:00
Hs 1304.6:11507
https://doi.org/10.7891/e-manuscripta-160662
Observer : Marco Cagnotti
Seeing (SIDC) : 3
No group