Sunspot drawing of 2018-6-30

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https://doi.org/10.7891/e-manuscripta-160100



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2018-06-30
08:15
Hs 1304.6:11254
https://doi.org/10.7891/e-manuscripta-160100
Observer : Marco Cagnotti
Seeing (SIDC) : 4
No group