Sunspot drawing of 2007-9-21

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https://doi.org/10.7891/e-manuscripta-154240



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2007-09-21
07:15
Hs 1304.6:8211
https://doi.org/10.7891/e-manuscripta-154240
Observer : Sergio Cortesi
Seeing (SIDC) : 4
No group