Wilhelm Bessel
was born 233 years ago
22nd July 1784

Wilhelm Bessel determined the positions and proper motions of stars and discoveredthe parallax of 61 Cygni. He also used a method of mathematical analysis involving what is now known as the Bessel function.

Find out more at:
http://www-history.mcs.st-andrews.ac.uk/Mathematicians/Bessel.html