Sunspot drawing of 2009-7-31

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https://doi.org/10.7891/e-manuscripta-155775



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2009-07-31
07:45
Hs 1304.6:8781
https://doi.org/10.7891/e-manuscripta-155775
Observer : Marco Cagnotti
Seeing (SIDC) : 2
No group