Sunspot drawing of 1974-2-21

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https://doi.org/10.7891/e-manuscripta-97874



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1974-02-21
07:45
Hs 1304.5:5299
https://doi.org/10.7891/e-manuscripta-97874
Observer : Sergio Cortesi
Seeing (SIDC) : 3
Group Not Weighted Weighted Type Latitude Carrington Longit.
16 2 A -19.6 139.5
18 27 E -18.6 150.7
19 2 B -16.9 132.9
3 31