Sunspot drawing of 2018-3-20

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https://doi.org/10.7891/e-manuscripta-159999



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2018-03-20
09:00
Hs 1304.6:11172
https://doi.org/10.7891/e-manuscripta-159999
Observer : Sergio Cortesi
Seeing (SIDC) : 3
No group