Sunspot drawing of 2018-7-18

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https://doi.org/10.7891/e-manuscripta-160067



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2018-07-18
08:00
Hs 1304.6:11272
https://doi.org/10.7891/e-manuscripta-160067
Observer : Sergio Cortesi
Seeing (SIDC) : 4
No group