Sunspot drawing of 2019-9-23

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https://doi.org/10.7891/e-manuscripta-160582



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2019-09-23
11:30
Hs 1304.6:11635
https://doi.org/10.7891/e-manuscripta-160582
Observer : Sergio Cortesi
Seeing (SIDC) : 3
No group