Sunspot drawing of 1987-1-12

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https://doi.org/10.7891/e-manuscripta-142873



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1987-01-12
09:00
Hs 1304.6:1804
https://doi.org/10.7891/e-manuscripta-142873
Observer : Sergio Cortesi
Seeing (SIDC) : 2
No group