Sunspot drawing of 2018-9-3

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https://doi.org/10.7891/e-manuscripta-159896



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2018-09-03
07:30
Hs 1304.6:11315
https://doi.org/10.7891/e-manuscripta-159896
Observer : Marco Cagnotti
Seeing (SIDC) : 2
No group