Sunspot drawing of 1971-4-20

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https://doi.org/10.7891/e-manuscripta-96838



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1971-04-20
07:00
Hs 1304.5:4435
https://doi.org/10.7891/e-manuscripta-96838
Observer : Sergio Cortesi
Seeing (SIDC) : 3
Group Not Weighted Weighted Type Latitude Carrington Longit.
117 3 J 2.1 182.8
118 12 H -5.5 174.5
119 36 E 18.7 150.4
120 7 C 8.8 157.1
121 4 B -18.1 149.3
122 4 J -3.5 210.5
126 5 A -11.2 77.9
128 6 B 11.7 125.5
8 77