Sunspot drawing of 1986-12-30

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https://doi.org/10.7891/e-manuscripta-142214
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1986-12-30
09:00
Hs 1304.6:1792
https://doi.org/10.7891/e-manuscripta-142214
Observer : Sergio Cortesi
Seeing (SIDC) : 3
No group