Argelander, Friedrich Wilhelm August (frēˈdrĭkh vĭlˈhĕlm ouˈgŏst ärˈgəländər) [key], 1799–1875, German astronomer. He became director of the observatory at the Univ. of Bonn in 1837 and continued there the work of determining the positions of stars that F. W. Bessel had begun at Königsberg. The results of his observations appear in the Bonner Durchmusterung (1862), which records the positions and brightness of more than 324,000 stars (up to the ninth magnitude) in the northern heavens.
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