Sunspot drawing of 2009-4-1

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https://doi.org/10.7891/e-manuscripta-155804



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2009-04-01
12:00
Hs 1304.6:8670
https://doi.org/10.7891/e-manuscripta-155804
Observer : Sergio Cortesi
Seeing (SIDC) : 3
No group