Sunspot drawing of 2010-4-20

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https://doi.org/10.7891/e-manuscripta-156274



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2010-04-20
08:00
Hs 1304.6:8994
https://doi.org/10.7891/e-manuscripta-156274
Observer : Marco Cagnotti
Seeing (SIDC) : 3
No group