Sunspot drawing of 2009-4-21

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https://doi.org/10.7891/e-manuscripta-155604



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2009-04-21
09:30
Hs 1304.6:8688
https://doi.org/10.7891/e-manuscripta-155604
Observer : Sergio Cortesi
Seeing (SIDC) : 3
No group