Bessel,Friedrich Wilhelm
Bes·sel (bĕsʹəl), Friedrich Wilhelm. 1784-1846.
Prussian astronomer who recalculated the orbit of Halley's comet (1804), verified by parallax the distance from Earth to the twin star 61 Cygni (1838), and developed a class of mathematical functions based on his study of planetary perturbation.

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Universalium. 2010.

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