Sunspot drawing of 2017-3-20

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https://doi.org/10.7891/e-manuscripta-159559



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2017-03-20
09:30
Hs 1304.6:10886
https://doi.org/10.7891/e-manuscripta-159559
Observer : Marco Cagnotti
Seeing (SIDC) : 4
No group