Sunspot drawing of 2018-1-23

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https://doi.org/10.7891/e-manuscripta-159955



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2018-01-23
09:00
Hs 1304.6:11138
https://doi.org/10.7891/e-manuscripta-159955
Observer : Sergio Cortesi
Seeing (SIDC) : 4
No group