Sunspot drawing of 1973-4-17

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https://doi.org/10.7891/e-manuscripta-97532



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1973-04-17
07:30
Hs 1304.5:5042
https://doi.org/10.7891/e-manuscripta-97532
Observer : Sergio Cortesi
Seeing (SIDC) : 3
Group Not Weighted Weighted Type Latitude Carrington Longit.
88 8 D -7.8 321.6
93 1 A 0.6 242.2
2 9