Sunspot drawing of 1986-8-20

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https://doi.org/10.7891/e-manuscripta-142088



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1986-08-20
07:30
Hs 1304.6:1680
https://doi.org/10.7891/e-manuscripta-142088
Observer : Sergio Cortesi
Seeing (SIDC) : 4
No group