Bessel may refer to:

Mathematics and science

Bessel beam Bessel may refer to: Mathematics and science * Bessel beam * Bessel ellipsoid * Bessel function in mathematics * Bessel's inequality in mathematics * Bessel's correction In statistics, Bessel's correction is the use of ''n'' − 1 in ...

Bessel ellipsoid The Bessel ellipsoid (or Bessel 1841) is an important reference ellipsoid of geodesy. It is currently used by several countries for their national geodetic surveys, but will be replaced in the next decades by modern ellipsoids of satellite geodes ...

Bessel function Bessel functions, named after Friedrich Bessel who was the first to systematically study them in 1824, are canonical solutions of Bessel's differential equation x^2 \frac + x \frac + \left(x^2 - \alpha^2 \right)y = 0 for an arbitrary complex ...

in mathematics * Bessel's inequality in mathematics *

Bessel's correction In statistics, Bessel's correction is the use of ''n'' − 1 instead of ''n'' in the formula for the sample variance and sample standard deviation, where ''n'' is the number of observations in a sample. This method corrects the bias in ...

in statistics *

Bessel filter In electronics and signal processing, a Bessel filter is a type of analog linear filter with a maximally flat Group delay and phase delay, group delay (i.e., maximally linear phase response), which preserves the wave shape of filtered signals in ...

, a linear filter often used in audio crossover systems * Bessel transform, also known as Fourier-Bessel transform or

Hankel transform In mathematics, the Hankel transform expresses any given function ''f''(''r'') as the weighted sum of an infinite number of Bessel functions of the first kind . The Bessel functions in the sum are all of the same order ν, but differ in a scalin ...

* Bessel window, in signal processing * Besselian date, see Epoch (astronomy)#Besselian years

Places

Bessel Fjord Bessel Fjord is a fjord in northeastern Greenland. Administratively it belongs to the NE Greenland National Park area. History The area around the mouth of this fjord was referred to as "Bessel Bay" at the time of the 1869–70 Second German Nor ...

, NE Greenland *

Bessel Fjord, NW Greenland Bessel Fjord () is a fjord in northwestern Greenland. Administratively it belongs to the Avannaata municipality. Knud Rasmussen described the fjord entrance in the following terms: Geography Bessel Fjord stretches roughly from north to south f ...

Bessel (crater) Bessel is a small lunar impact crater that is located in the southern half of the Mare Serenitatis. The crater was named after the German astronomer Friedrich Wilhelm Bessel in 1935. Despite its small size, this is the largest crater to lie en ...

, a small lunar crater

People

Surname

Friedrich Wilhelm Bessel Friedrich Wilhelm Bessel (; 22 July 1784 – 17 March 1846) was a German astronomer, mathematician, physicist, and geodesist. He was the first astronomer who determined reliable values for the distance from the Sun to another star by the method ...

(1784–1846), German mathematician, astronomer, and systematizer of the Bessel functions * Johann Franz Bessel (1672–1749), German Benedictine abbot and historian * Vasily Bessel (1843–1907), Russian music publisher

Given name

* Bessel Kok (born 1941), Dutch businessman and chess organiser * Bessel van der Kolk (born 1943), Dutch psychiatrist

Other uses