Sunspot drawing of 1987-2-6

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https://doi.org/10.7891/e-manuscripta-142854



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1987-02-06
09:00
Hs 1304.6:1824
https://doi.org/10.7891/e-manuscripta-142854
Observer : Sergio Cortesi
Seeing (SIDC) : 4
No group