Sunspot drawing of 2009-2-21

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https://doi.org/10.7891/e-manuscripta-155680



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2009-02-21
08:15
Hs 1304.6:8636
https://doi.org/10.7891/e-manuscripta-155680
Observer : Sergio Cortesi
Seeing (SIDC) : 2
No group