Sunspot drawing of 2017-7-20

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https://doi.org/10.7891/e-manuscripta-159555



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2017-07-20
07:30
Hs 1304.6:10989
https://doi.org/10.7891/e-manuscripta-159555
Observer : Marco Cagnotti
Seeing (SIDC) : 3
No group