Sunspot drawing of 2019-7-21

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https://doi.org/10.7891/e-manuscripta-160555



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2019-07-21
08:00
Hs 1304.6:11578
https://doi.org/10.7891/e-manuscripta-160555
Observer : Sergio Cortesi
Seeing (SIDC) : 4
No group