Sunspot drawing of 1969-8-20

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https://doi.org/10.7891/e-manuscripta-95912



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1969-08-20
07:30
Hs 1304.5:3927
https://doi.org/10.7891/e-manuscripta-95912
Observer : Sergio Cortesi
Seeing (SIDC) : 3
Group Not Weighted Weighted Type Latitude Carrington Longit.
342 3 J 9.4 287.3
348 18 B -13.6 250.3
2 21