Sunspot drawing of 2017-4-8

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https://doi.org/10.7891/e-manuscripta-159396



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2017-04-08
07:00
Hs 1304.6:10900
https://doi.org/10.7891/e-manuscripta-159396
Observer : Marco Cagnotti
Seeing (SIDC) : 3
No group