Sunspot drawing of 2009-9-17

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https://doi.org/10.7891/e-manuscripta-155564



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2009-09-17
07:45
Hs 1304.6:8827
https://doi.org/10.7891/e-manuscripta-155564
Observer : Sergio Cortesi
Seeing (SIDC) : 4
No group