Johann Georg Hagen

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Johann Georg Hagen
Hagen in a 1917 publication
Born(1847-03-06)March 6, 1847
Bregenz, Austria
DiedSeptember 6, 1930(1930-09-06) (aged 83)
Rome, Italy
Education
Occupation(s)Clergyman, astronomer
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Johann (John) Georg Hagen (March 6, 1847 – September 6, 1930) was an Austrian

Maria Elizabeth Hesselblad (1870-1957), who was baptized by him on August 15, 1902 and eventually was canonized on June 5, 2016 by Pope Francis.[1]

Early life

Johann Georg Hagen was born in Bregenz, Austria on 6 March 1847, the son of a school teacher.[2]

Entering the Jesuit Order

Johann entered the

Society of Jesus, commonly known as the Jesuits, in Gorheim, Germany in 1863. He attended the Jesuit College Stella Matutina in Feldkirch, Austria and also studied mathematics and astronomy at the University of Bonn and the University of Münster. He volunteered for the ambulance service in the Franco-Prussian War, but was struck with typhoid fever
.

Expulsion

On July 4, 1872,

priesthood
.

Emigration to US

In June 1880, he left England for the

naturalized citizen
.

He was called to serve as the Director of the Georgetown University Observatory in 1888. There he continued his research and published numerous articles and texts. In mathematics, the Rothe–Hagen identity is named after him; it appears in his three-volume 1891 publication, Synopsis of Higher Mathematics.

He contributed several articles on astronomical topics to the Catholic Encyclopedia.[2]

Vatican Observatory

In 1906, John was called by Pope Pius X to take charge of the Vatican Observatory in Rome. He died in Rome on September 6, 1930.[3]

The crater Hagen, 55 km in diameter, on the far side of the Moon is named after him.

Publications

  • Atlas Stellarum Variabilium (Atlas of variable stars) (in Latin). Berlin: Felix L. Dames. 1890–1908.[4]
  • with G. A. Fargis: The photochronograph, and its applications to star transits. Georgetown, D. C.: Georgetown College Observatory. 1891.[5]
  • Synopsis der höheren Mathematik. Vol. 4 vols. Berlin: F. L. Dames.Vol. 1: Arithmetische und algebraische Analyse. 1891.Vol. 2: Geometrie der algebraischen Gebilde. 1894.Vol. 3: Differential- und Integralrechnung. 1905.Vol. 4: Differentialgeometrie der Ebene und des Raumes. 1930.
  • Index operum Leonardi Euleri. Berlin: F. L. Dames. 1896.[6]
  • Hagen, J. G. (1900). "On the history of the extensions of the calculus". Bull. Amer. Math. Soc. 6 (9): 381–390.
    MR 1557730
    .
  • La rotation de la terre, ses preuves mécaniques anciennes et nouvelles. Rome: Tipografia Vaticana. 1911.

See also

Wikisource has original works by or about:
Johann Georg Hagen
  • List of craters on the Moon, G-K
  • List of Roman Catholic scientist-clerics

References

  1. ^ "Maria Elisabetta Hesselblad (1870–1957)". Vatican News. Retrieved June 9, 2021.
  2. ^
    The Encyclopedia Press
    . 1917. p. 72. Retrieved June 9, 2021 – via archive.org.
  3. ^ "Father Hagen Dies, Vatican Astronomer". Courier-Post. Vatican City. INS. September 6, 1930. p. 2. Retrieved June 9, 2021 – via Newspapers.com.
  4. doi:10.1086/141461
    .
  5. doi:10.1090/s0002-9904-1891-00025-5
    .
  6. doi:10.1090/s0002-9904-1897-00417-7
    .
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