Friedrich Wilhelm Bessel

Friedrich Wilhelm Bessel (German: [ˈbɛsl̩]; 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 of parallax. Certain important mathematical functions were first studied systematically by Bessel and were named Bessel functions in his honour.

Notable works: Fundamenta Astronomiae, Bessel function, Bessel ellipsoid, Bessel polynomials, Besselian elements, Bessel's correction, Bessel's inequality, Bessel process Awards: Pour le Mérite for Sciences and Arts order, Lalande Prize, Gold Medal of the Royal Astronomical Society, Order of the Red Eagle 2nd Class, Fellow of the American Academy of Arts and Sciences, Foreign Member of the Royal Society

Source: Wikipedia — https://en.wikipedia.org/wiki/Friedrich_Wilhelm_Bessel