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Achille Pierre Dionis du Séjour (January 11, 1734 – August 22, 1794) was a French astronomer and mathematician. Electronic Enlightenment Project (2008) ''Achille Pierre Dionis Du Séjour correspondence.''
Dionis du Séjour was born in Paris and was a distant relative of surgeon and anatomist Pierre Dionis. He served as an advisor to parliament before he was appointed to the
Achille Pierre Dionis du Séjour biography
via University of St. Andrews 1734 births 1794 deaths 18th-century French astronomers 18th-century French mathematicians Members of the French Academy of Sciences Fellows of the Royal Society Scientists from Paris {{france-mathematician-stub
Achille Pierre Dionis du Séjour (January 11, 1734 – August 22, 1794) was a French astronomer and mathematician. Electronic Enlightenment Project (2008) ''Achille Pierre Dionis Du Séjour correspondence.''
Dionis du Séjour was born in Paris and was a distant relative of surgeon and anatomist Pierre Dionis. He served as an advisor to parliament before he was appointed to the French Academy of Sciences
The French Academy of Sciences (French: ''Académie des sciences'') is a learned society, founded in 1666 by Louis XIV of France, Louis XIV at the suggestion of Jean-Baptiste Colbert, to encourage and protect the spirit of French Scientific me ...
in 1765. In 1775 he was elected a Fellow of the Royal Society. He was appointed to the Paris group for the Estates-General of 1789 and was one of the 47 who joined the Estates of the Realm that year.
Dionis du Séjour died in Vernou-la-Celle-sur-Seine.
Publications
* ''Traité des courbes algébriques'' (Treatise on Algebraic Curves), with Mathieu-Bernard Goudin (1756) * ''Recherches sur le gnomonique et les rétrogradations des planètes'' (Research on sundials and retrograde motions of Planets), (1761) * ''Traité des mouvements apparents des corps célestes'' (Treatise onapparent retrograde motion
Apparent retrograde motion is the apparent motion of a planet in a direction opposite to that of other bodies within its system, as observed from a particular vantage point. Direct motion or prograde motion is motion in the same direction as ...
of celestial bodies), (1774)
* ''Essai sur les comètes'' (Essay on comets) (1775)
* ''Essai sur les disparitions périodiques de l'anneau de Saturne'' (Essay on the periodic disappearance of the ring of Saturn), (1776)
References
External links
Achille Pierre Dionis du Séjour biography
via University of St. Andrews 1734 births 1794 deaths 18th-century French astronomers 18th-century French mathematicians Members of the French Academy of Sciences Fellows of the Royal Society Scientists from Paris {{france-mathematician-stub