Sunspot drawing of 1974-9-20

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https://doi.org/10.7891/e-manuscripta-97793



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1974-09-20
08:30
Hs 1304.5:5488
https://doi.org/10.7891/e-manuscripta-97793
Observer : Araldo Pittini
Seeing (SIDC) : 3
Group Not Weighted Weighted Type Latitude Carrington Longit.
149 28 D 9.2 267.5
153 9 B 9.6 183.0
2 37