Friedrich Bessel
German astronomer and mathematician
Summary
Updated 2026-05-29
Bessel was the astronomer who first nailed the distance to another star using parallax—a measurement that basically proved the universe was bigger than anyone thought. The mathematical functions bearing his name became standard tools in physics.
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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.
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