Friedrich Bessel
22 July 1784 — 17 March 1846
Friedrich Wilhelm Bessel 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.
A memorial on Digital Cemetery, an endless map you can explore. This grave stands at coordinates 12, 15.