Sunspot drawing of 2007-7-21

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https://doi.org/10.7891/e-manuscripta-154492



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2007-07-21
07:15
Hs 1304.6:8151
https://doi.org/10.7891/e-manuscripta-154492
Observer : Sergio Cortesi
Seeing (SIDC) : 3
No group