Sunspot drawing of 2017-7-27

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https://doi.org/10.7891/e-manuscripta-159434



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2017-07-27
09:00
Hs 1304.6:10996
https://doi.org/10.7891/e-manuscripta-159434
Observer : Sergio Cortesi
Seeing (SIDC) : 3
No group