Charles-Eugène Delaunay

Charles-Eugène Delaunay
Charles-Eugène Delaunay
Born(1816-04-09)9 April 1816
Died5 August 1872(1872-08-05) (aged 56)
Cherbourg, France
NationalityFrench
Known forDelaunay variables
Scientific career
FieldsAstronomy
Celestial mechanics
InstitutionsParis Observatory

Charles-Eugène Delaunay (French pronunciation: [ʃaʁl øʒɛn dəlonɛ]; 9 April 1816 – 5 August 1872) was a French astronomer and mathematician. His lunar motion studies were important in advancing both the theory of planetary motion and mathematics.

Life

Born in Lusigny-sur-Barse, France, to Jacques‐Hubert Delaunay and Catherine Choiselat, Delaunay studied under Jean-Baptiste Biot at the Sorbonne. He worked on the mechanics of the Moon as a special case of the three-body problem. He published two volumes on the topic, each of 900 pages in length, in 1860 and 1867. The work hints at chaos in the system, and clearly demonstrates the problem of so-called "small denominators" in perturbation theory. His infinite series expression for finding the position of the Moon converged too slowly to be of practical use but was a catalyst in the development of functional analysis and computer algebra.

Delaunay became director of the Paris Observatory in 1870 but drowned in a boating accident near Cherbourg, France, two years later. He was followed by Jean Claude Bouquet at the Academy. Peter Guthrie Tait in his book An Elementary Treatise on Quaternions edition 1867 on page 244 named Didonia in honour of Delaunay.

Honours


This page was last updated at 2023-10-28 10:51 UTC. Update now. View original page.

All our content comes from Wikipedia and under the Creative Commons Attribution-ShareAlike License.


Top

If mathematical, chemical, physical and other formulas are not displayed correctly on this page, please useFirefox or Safari