Sunspot drawing of 2017-3-9

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https://doi.org/10.7891/e-manuscripta-159660



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2017-03-09
09:30
Hs 1304.6:10875
https://doi.org/10.7891/e-manuscripta-159660
Observer : Marco Cagnotti
Seeing (SIDC) : 2
No group