Sunspot drawing of 2017-7-4

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https://doi.org/10.7891/e-manuscripta-159518



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2017-07-04
08:00
Hs 1304.6:10974
https://doi.org/10.7891/e-manuscripta-159518
Observer : Sergio Cortesi
Seeing (SIDC) : 3
No group