Sunspot drawing of 2017-5-15

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https://doi.org/10.7891/e-manuscripta-159666



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2017-05-15
09:00
Hs 1304.6:10930
https://doi.org/10.7891/e-manuscripta-159666
Observer : Sergio Cortesi
Seeing (SIDC) : 4
No group