French
French may refer to:
* Something of, from, or related to France
** French language, which originated in France
** French people, a nation and ethnic group
** French cuisine, cooking traditions and practices
Arts and media
* The French (band), ...
physicist
A physicist is a scientist who specializes in the field of physics, which encompasses the interactions of matter and energy at all length and time scales in the physical universe. Physicists generally are interested in the root or ultimate cau ...
and
astronomer
An astronomer is a scientist in the field of astronomy who focuses on a specific question or field outside the scope of Earth. Astronomers observe astronomical objects, such as stars, planets, natural satellite, moons, comets and galaxy, galax ...
, and excelled at school there, moving to grammar school in
Poitiers
Poitiers is a city on the river Clain in west-central France. It is a commune in France, commune, the capital of the Vienne (department), Vienne department and the historical center of Poitou, Poitou Province. In 2021, it had a population of 9 ...
John Herschel
Sir John Frederick William Herschel, 1st Baronet (; 7 March 1792 – 11 May 1871) was an English polymath active as a mathematician, astronomer, chemist, inventor and experimental photographer who invented the blueprint and did botanical work. ...
in a joint French-British governmental study of the difference in longitudes between the observatories of
Paris
Paris () is the Capital city, capital and List of communes in France with over 20,000 inhabitants, largest city of France. With an estimated population of 2,048,472 residents in January 2025 in an area of more than , Paris is the List of ci ...
and
Greenwich
Greenwich ( , , ) is an List of areas of London, area in south-east London, England, within the Ceremonial counties of England, ceremonial county of Greater London, east-south-east of Charing Cross.
Greenwich is notable for its maritime hi ...
. In 1829, he entered the
Bureau des Longitudes
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The ''Bureau des Longitudes'' () is a French scientific institution, founded by decree of 25 June 1795 and charged with the improvement of nautical navigation, standardisation of time-keeping, geodesy and astronomical observation. Durin ...
and, in 1832, became the secretary-librarian of the
Paris Observatory
The Paris Observatory (, ), a research institution of the Paris Sciences et Lettres University, is the foremost astronomical observatory of France, and one of the largest astronomical centres in the world. Its historic building is on the Left Ban ...
and studied
geodesy
Geodesy or geodetics is the science of measuring and representing the Figure of the Earth, geometry, Gravity of Earth, gravity, and Earth's rotation, spatial orientation of the Earth in Relative change, temporally varying Three-dimensional spac ...
with
François Arago
Dominique François Jean Arago (), known simply as François Arago (; Catalan: , ; 26 February 17862 October 1853), was a French mathematician, physicist, astronomer, freemason, supporter of the Carbonari revolutionaries and politician.
Early l ...
. He both edited and submitted to the ''
Connaissance des Temps
The ''Connaissance des temps'' (English: Knowledge of the Times) is an official yearly publication of astronomical ephemerides in France. Until just after the French Revolution, the title appeared as ''Connoissance des temps'', and for several ye ...
'', the astronomical
ephemerides
In astronomy and celestial navigation, an ephemeris (; ; , ) is a book with tables that gives the trajectory of naturally occurring astronomical objects and artificial satellites in the sky, i.e., the position (and possibly velocity) over time. ...
used by many navigators, geographers and astronomers of the time.
He developed a method of calculating tables to determine the phases of the moon over much longer durations than before (over 30 centuries). Presented at the
French Academy of Sciences
The French Academy of Sciences (, ) is a learned society, founded in 1666 by Louis XIV at the suggestion of Jean-Baptiste Colbert, to encourage and protect the spirit of French Scientific method, scientific research. It was at the forefron ...
, it earned admission as a Free Academician on December 13, 1847. This work, in concert with a
Xia dynasty
The Xia dynasty (; ) is the first dynasty in traditional Chinese historiography. According to tradition, it was established by the legendary figure Yu the Great, after Emperor Shun, Shun, the last of the Three Sovereigns and Five Emperors, Fiv ...
document preserved in a
Chinese classic
Chinese may refer to:
* Something related to China
* Chinese people, people identified with China, through nationality, citizenship, and/or ethnicity
**Han Chinese, East Asian ethnic group native to China.
**''Zhonghua minzu'', the supra-ethnic ...
, the ''
Book of Documents
The ''Book of Documents'' ( zh, p=Shūjīng, c=書經, w=Shu King) or the ''Classic of History'', is one of the Five Classics of ancient Chinese literature. It is a collection of rhetorical prose attributed to figures of ancient China, a ...
'', allowed the calculation of the date of a solar eclipse recorded during the reign of
Zhong Kang
Zhong Kang () was the fourth king of the Xia dynasty, the first dynasty in traditional Chinese history.
Family
Zhong Kang was a son of king Qi of Xia and thus the younger brother of Tai Kang. He was the father of Xiang of Xia.
Reign
Accordi ...
.
He was appointed a Chavalier of the
Legion of Honour
The National Order of the Legion of Honour ( ), formerly the Imperial Order of the Legion of Honour (), is the highest and most prestigious French national order of merit, both military and Civil society, civil. Currently consisting of five cl ...