Sunspot drawing of 1986-1-20

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https://doi.org/10.7891/e-manuscripta-142280



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1986-01-20
09:30
Hs 1304.6:1508
https://doi.org/10.7891/e-manuscripta-142280
Observer : Sergio Cortesi
Seeing (SIDC) : 3
No group