Barnaba Oriani (July 17, 1752 0 November 12, 1832) was an Italian priest, geodesist, astronomer and scientist. After completing his studies in the humanities, physical and mathematical sciences, philosophy, and theology, he was ordained as a priest in 1775. A very capable astronomer, his researched astronomic refraction, the obliquity of the ecliptic and orbital theory, but his greatest achievement was his detailed research of the planet Uranus. He devoted significant time to observations of Uranus, calculating its orbital properties, which he published as a booklet of tables in 1793. In 1789, he improved his calculations by accounting for the gravitational effects of Jupiter and Saturn. He was appointed on the staff of the Observatory of Brera in Milan in 1776, becoming assistant astronomer in 1778 and director in 1802. He was a devoted friend of the Theatine monk, Giuseppe Piazzi, the discoverer of Ceres. They worked together for 37 years, cooperating on many astronomical observations. He died in 1832 at the age of 80.