"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 ...
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reliable values for the distance from the sun to another star by the method of parallax. A special type of mathematical functions were named Bessel functions after Bessel´s death, though they had originally been discovered by Daniel Bernoulli and then generalised by Bessel." - (en.wikipedia.org 31.01.2020)
