Sunspot drawing of 1987-5-21

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https://doi.org/10.7891/e-manuscripta-142929



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1987-05-21
07:30
Hs 1304.6:1908
https://doi.org/10.7891/e-manuscripta-142929
Observer : Sergio Cortesi
Seeing (SIDC) : 3
Group Not Weighted Weighted Type Latitude Carrington Longit.
46 3 3 A -24 347
47 30 51 D 28 343
48 6 6 B 33 339
3 39 60