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- W4387307615 abstract "Abstract Digital images of sunspot drawings of the archives of Georg Christoph Eimmart stored at the National Library of Russia, St. Petersburg, are analyzed to obtain sunspot-group numbers and sunspot areas as well as heliographic positions. Overall, more than a hundred drawings were processed. The impact of drawing and reproduction uncertainties and the aims of historical observations are considered. The sunspot positions are compared to those reported by contemporary observers of the Maunder minimum. The restored sunspot-group numbers and latitudes are compared to those extracted by Hoyt and Schatten ( Solar Phys . 179 , 189, 1998) as well as Hayakawa et al. ( Solar Phys . 296 , 154, 2021b) and Hayakawa et al. ( Astrophys . J . 909 , 166, 2021d). The persistence of long-lived sunspots over several solar rotations is discussed." @default.
- W4387307615 created "2023-10-04" @default.
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- W4387307615 date "2023-10-01" @default.
- W4387307615 modified "2023-10-05" @default.
- W4387307615 title "Sunspot Observations at the Eimmart Observatory: Revision and Supplement" @default.
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- W4387307615 doi "https://doi.org/10.1007/s11207-023-02208-4" @default.
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