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Dom Placidus Fixlmillner, O.S.B., (May 28, 1721 – August 27, 1791)[1] was a Benedictine monk and priest and was one of the first astronomers to compute the orbit of Uranus.[2]

Biography

Born in the village of Achleuthen[3] near Kremsmünster, Austria, Fixlmillner was educated in Salzburg, where he displayed an aptitude in mathematics. At the age of 16, he joined the Benedictine monks of Kremsmünster Abbey, where his uncle was the abbot.

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 an observatory at the abbey, 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 by the Holy See 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, Dom 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.

See also

• List of Roman Catholic scientist-clerics

References

•  This article incorporates text from a publication now in the public domain: Herbermann, Charles, ed. (1913). Catholic Encyclopedia. New York: Robert Appleton Company. {{cite encyclopedia}}: Missing or empty |title= (help)

На других языках

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[de] Placidus Fixlmillner

Placidus Fixlmillner OSB (auch Plazidus Fixlmillner; * 28. Mai 1721 in Achleiten bei Kremsmünster, Oberösterreich als Josef Fixlmüller; † 27. August 1791 im Stift Kremsmünster) war ein vielseitiger Wissenschafter, Jurist und Hochschullehrer des Spätbarock. Er wurde insbesondere als Astronom und in der Musiktheorie bekannt. Von 1762 bis 1791 war der Benediktinerpater Direktor der Sternwarte Kremsmünster und der Laboratorien des Stiftes.

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- [en] Placidus Fixlmillner

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