Sunspot drawing of 1987-2-21

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https://doi.org/10.7891/e-manuscripta-142777



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1987-02-21
09:30
Hs 1304.6:1831
https://doi.org/10.7891/e-manuscripta-142777
Observer : Marco Cortesi
Seeing (SIDC) : 4
Group Not Weighted Weighted Type Latitude Carrington Longit.
11 1 1 A -26 19
1 1 1