Franz Xaver von Zach

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Franz Xaver von Zach
Born(1754-06-04)4 June 1754
Died2 September 1832(1832-09-02) (aged 78)
Paris
NationalityHungarian
Scientific career
Fieldsastronomy

Baron Franz Xaver von Zach (Franz Xaver Freiherr von Zach; 4 June 1754 – 2 September 1832) was a Hungarian astronomer born at Pest, Hungary (now Budapest in Hungary).

Biography

L'attraction des montagnes, 1814

Zach studied physics at the

Titius-Bode law between Mars and Jupiter. Ceres was discovered by accident just as the search was getting underway. Using predictions made of the position of Ceres by Carl Friedrich Gauss, on 31 December 1801/1 January 1802, Zach (and, independently one night later, Heinrich Wilhelm Matthias Olbers) recovered Ceres after it was lost during its passage behind the Sun. After the death of the duke in 1804, Zach accompanied the duke's widow on her travels in the south of Europe, and the two settled in Genoa in 1815 where he directed an observatory. He moved back to Paris in 1827 and died there in 1832.[2]

Zach published Tables of the Sun (Gotha, 1792; new and improved edition, Gotha, 1804), and numerous papers on geographical subjects, particularly on the geographical positions of many towns and places, which he determined on his travels with a sextant.[2]

His principal importance was, however, as editor of three scientific journals of great value: Allgemeine Geographische Ephemeriden (4 vols., Gotha, 1798–1799), Monatliche Correspondenz zur Beförderung der Erd- und Himmels-Kunde (28 vols., Gotha, 1800–1813, from 1807 edited by

Jesuits).[2]

He was elected as a member of the Royal Swedish Academy of Sciences in 1794, a Foreign Honorary Member of the American Academy of Arts and Sciences in 1798,[3] a Fellow of the Royal Society in 1804, and an honorary member of the Hungarian Academy of Sciences in 1832.

In 1808, von Zach was in

Pyrénées which can be seen twice a year from there, 250 km away, by refraction of light.[4]

Asteroid 999 Zachia and the crater Zach on the Moon are named after him, while asteroid 64 Angelina is named after an astronomical station he set up near Marseille.

Works

  • Tables abrégées et portatives du soleil (in French). Pisa: Molini & Landi & C. 1809.
  • Mémoire sur le degré du méridien mesuré en Piemont par le père Beccaria (in French). 1810.
  • Attraction des montagnes, et ses effets sur les fils a plomb ou sur les niveaux des instrumens d'astronomie (in French). Avignon: François Seguin (2.). 1814.

References

  1. ^ "5 відомих імен львівської Астрономічної обсерваторії - leopolis.one". 8 November 2022.
  2. ^ a b c  One or more of the preceding sentences incorporates text from a publication now in the public domainChisholm, Hugh, ed. (1911). "Zach, Franz Xaver, Baron von". Encyclopædia Britannica. Vol. 28 (11th ed.). Cambridge University Press. p. 949.
  3. ^ "Book of Members, 1780–2010: Chapter B" (PDF). American Academy of Arts and Sciences. Retrieved 28 July 2014.
  4. OCLC 893847466
    .

Further reading