f. wilhelm bessel

Bessel

[bes-uhl]
noun
Friedrich Wilhelm [free-drik wil-helm; German free-drikh vil-helm] , 1784–1846, German astronomer.
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Bessel (ˈbɛsəl)
 
n
Friedrich Wilhelm (ˈfriːdrɪç ˈvɪlhɛlm). 1784--1846, German astronomer and mathematician. He made the first authenticated measurement of a star's distance (1841) and systematized a series of mathematical functions used in physics

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