Sunspot drawing of 1987-6-21

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https://doi.org/10.7891/e-manuscripta-143023



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1987-06-21
08:00
Hs 1304.6:1934
https://doi.org/10.7891/e-manuscripta-143023
Observer : Marco Cortesi
Seeing (SIDC) : 4
Group Not Weighted Weighted Type Latitude Carrington Longit.
58 4 8 C -31 255
59 14 22 B 19 260
2 18 30