Sunspot drawing of 2009-5-21

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https://doi.org/10.7891/e-manuscripta-155539



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2009-05-21
07:15
Hs 1304.6:8713
https://doi.org/10.7891/e-manuscripta-155539
Observer : Sergio Cortesi
Seeing (SIDC) : 3
No group