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Placidus Fixlmillner.
Placidus Fixlmillner (1721 – 1791) was the first astronomer to compute the orbit of Uranus.


Born in Achleuthen near Kremsmünstermarker, Austriamarker, he was educated in Salzburgmarker, where he displayed an aptitude in mathematics. He joined the Benedictines at sixteen.

In 1756 he published a small non-astronomical treatise entitled Reipublicæ sacræ origines divinæ which was interrupted in 1761 when he returned to studying the transit of Venus. He was appointed director of the observatory at Kremsmünster Abbeymarker, which had been established by his uncle. He continued in charge of the observatory until his death. Outside astronomy, he was in charge of the college connected with the abbey and acted as professor of canon law. He was honoured with the office of notary Apostolic of the Roman Court.

He was one of the first to compute the orbit of Uranus after its discovery by Herschel. His numerous observations of Mercury were of much service to Lalande in constructing tables of that planet.

Besides the treatise already mentioned he was the author of Meridianus speculæ astronomicæ cremifanensis (Steyer, 1765), which treats of his observations in connexion with the latitude and longitude of his observatory, and Decennium astronomicum (Steyer, 1776). After his death his successor P. Derfflinger published the Acta cremifanensia a Placido Fixlmillner (Steyer, 1791), which contain his observations from 1776 to 1791.

He died at Kremsmünster on 27 August 1791.


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