Philippe Gustave le Doulcet, Comte de Pontécoulant
He was the younger son of Louis Gustave le Doulcet, Comte de Pontécoulant and was the brother of Louis-Adolphe Pontécoulant. After 1811 he served in the army until 1849. Following his retirement he dedicated himself to the study of mathematics and astronomy.
In 1829 he used the mathematical methods of Poisson and Lagrange to successfully predict the return of Halley's comet with good precision. His prediction of the perihelion passage was correct to within two days.
- 1829-1846, "Théorie Analytique du Système du Monde", Paris.
- 1840, "Traité élémentaire de Physique Céleste", Paris, 2 volumes.
- 1864, "Notice sur la comète de Halley et ses apparitions successives de 1531 à 1910", Comptes rendus hebdomadaires des séances de l’Académie des sciences, 58, 706-709
- George Forbes, "History of Astronomy".
- Portrait of Gustave Pontecoulant from the Lick Observatory Records Digital Archive, UC Santa Cruz Library's Digital Collections
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