Sunspot drawing of 1986-12-31

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https://doi.org/10.7891/e-manuscripta-142159



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1986-12-31
09:00
Hs 1304.6:1793
https://doi.org/10.7891/e-manuscripta-142159
Observer : Sergio Cortesi
Seeing (SIDC) : 2
No group