Sunspot drawing of 2007-4-20

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https://doi.org/10.7891/e-manuscripta-154353



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2007-04-20
07:00
Hs 1304.6:8066
https://doi.org/10.7891/e-manuscripta-154353
Observer : Sergio Cortesi
Seeing (SIDC) : 4
No group