Sunspot drawing of 2009-4-20

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https://doi.org/10.7891/e-manuscripta-155547



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2009-04-20
09:30
Hs 1304.6:8687
https://doi.org/10.7891/e-manuscripta-155547
Observer : Sergio Cortesi
Seeing (SIDC) : 4
No group