Wilhelm Bessel

was born 235 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://mathshistory.st-andrews.ac.uk/Biographies/Bessel.html