Bessel


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Bes·sel

 (bĕs′əl), Friedrich Wilhelm 1784-1846.
Prussian astronomer who recalculated the orbit of Halley's comet (1804), used parallax to measure 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.

Bessel

(ˈbɛsəl)
n
(Biography) 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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Noun1.Bessel - German mathematician and astronomer who made accurate measurements of stellar distances and who predicted the existence on an 8th planet (1784-1846)
References in periodicals archive ?
Meanwhile, Friedrich Wilhelm Bessel (1784-1846) started work on parallax in Konigsberg, East Prussia.
Bessel (1784-1846) first achieved fame by computing the orbit of Halley's comet.
Bessel beam imaging uses superthin sheets of light to image live cells--and their innards--in action (Pages 23, 26).
To be more flexible in modeling and characterizing paper formation, we introduce a generalized version of the exponential correlation function which depends on an additional positive parameter: the modified Bessel correlation function which is defined as
This classical result has been extended in many directions, as ultraspherical polynomials, Lagguere and Hermite polynomials, or Bessel functions, and so forth.
In returning to The Meadows, where she had been based for 11 years, Black joins a group of senior fellows that includes Pia Mellody, John Bradshaw, Peter Levine, Bessel van der Kolk, Jerry Boriskin and Shelley Uram.
We study complete non-ambiguous trees, defined as non-ambiguous trees such that their underlying binary tree is complete, and show that their enumerating sequence is related to the formal power series of the logarithm of the Bessel function of order 0.
m] is the m-th order Bessel function of the 1st kind , m = 0, 1, 2,.
Now being developed is a real-time alerts app that will trigger consumer notices via third-party home banking providers on 20 different conditions or activities, said COCC spokesman Robert Bessel.
EMDR's effectiveness for posttraumatic stress disorder (PTSD) has been verified by numerous studies over the years, including a randomized, placebo-controlled clinical trial led by Bessel A.
Michael Bessel, BYK-Chemie, Germany; "UV Curable Waterborne Resins for Furniture and Cabinetry Coatings" presented by Wenli Jin, Allnex Resins (HQ: Belgium); "Isocyanate Free PU Coatings - Fundamental Chemistry and Performance Attributes" presented by Yawei Xu, Dow Chemical, USA; "Market Research Report on WB Wood Coatings" presented by Ariel Jiang, WBCP, P.
The proof that Brahe sought but that eluded him was not forthcoming until Friedrich Bessel, director of the Konigsberg Observatory in Prussia, was able to measure the parallax of the stars in 1838.