Sunspot drawing of 2009-2-20

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https://doi.org/10.7891/e-manuscripta-155689



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2009-02-20
08:15
Hs 1304.6:8635
https://doi.org/10.7891/e-manuscripta-155689
Observer : Sergio Cortesi
Seeing (SIDC) : 2
No group