German astronomer and student of Johann Gottfried Galle who is known for contributions in the discovery of the planet Neptune. After receiving the calculations by French mathematician, Urbain Le Verrier, the two German scientists pointed the telescope and observed the planet Neptune for the first time. This is regarded as an important turning point in 19th Century astronomy.
FYI, Neptune had first been observed by Galileo Galilei, but the great Italian astronomer had classified it as a fixed star.
