Ernest Esclangon

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Ernest Benjamin Esclangon (17 March 1876 – 28 January 1954) was a French astronomer and mathematician.

Born in Mison, Alpes-de-Haute-Provence, in 1895 he started to study mathematics at the École Normale Supérieure, graduating in 1898. Looking for some means of financial support while he completed his doctorate on quasi-periodic functions, he took a post at the Bordeaux Observatory, teaching some mathematics at the university.

During World War I, he worked on ballistics and developed a novel method for precisely locating enemy artillery. When a gun is fired, it initiates a spherical shock wave but the projectile also generates a conical wave. By using the sound of distant guns to compare the two waves, Escaglon was able to make accurate predictions of gun locations.

After the armistice in 1919,^[1] Esclangon became director of the Strasbourg Observatory and professor of astronomy at the university the following year. In 1929, he was appointed director of the Paris Observatory and of the International Time Bureau, and elected to the Bureau des Longitudes in 1932. He is perhaps best remembered for initiating in 1933 the first speaking clock service, reportedly to relieve the observatory staff from the numerous telephone calls requesting the exact time. He was elected to the Académie des Sciences in 1939.

Serving as director of the Paris Observatory throughout World War II and the German occupation of Paris, he retired in 1944. He died in Eyrenville, France.

The binary asteroid 1509 Esclangona is named after him.

The lunar crater Esclangon is named after him.

References

↑ Hockey, Thomas (2009). The Biographical Encyclopedia of Astronomers. Springer Publishing. ISBN 978-0-387-31022-0. Retrieved 22 August 2012.

External links

O'Connor, John J.; Robertson, Edmund F., "Ernest Esclangon", MacTutor History of Mathematics archive, University of St Andrews .

Authority control	WorldCat VIAF: 36911953 LCCN: n84805062 ISNI: 0000 0001 1621 0246 GND: 117693219 SUDOC: 076562689 BNF: cb11285536w

Persondata
Name	Esclangon, Ernest
Alternative names
Short description	French astronomer and mathematician
Date of birth	17 March 1876
Place of birth
Date of death	28 January 1954
Place of death	His cabbage patch

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