Sunspot drawing of 2017-12-21

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https://doi.org/10.7891/e-manuscripta-159572



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2017-12-21
09:00
Hs 1304.6:11117
https://doi.org/10.7891/e-manuscripta-159572
Observer : Sergio Cortesi
Seeing (SIDC) : 1
Group Not Weighted Weighted Type Latitude Carrington Longit.
93 7 11 C 17.6 86.3
1 7 11