Sunspot drawing of 2009-4-18

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https://doi.org/10.7891/e-manuscripta-155827



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2009-04-18
07:30
Hs 1304.6:8686
https://doi.org/10.7891/e-manuscripta-155827
Observer : Sergio Cortesi
Seeing (SIDC) : 4
No group