Achille Pierre Dionis du Séjour

Achille Pierre Dionis du Séjour (January 11, 1734 – August 22, 1794) was a French astronomer and mathematician.[1]

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 in 1765. 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. In 1775 he was elected a Fellow of the Royal Society.[2]

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 on apparent retrograde motion 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)
gollark: Sadly, yes, first-past-the-post is awful that way.
gollark: Yes, I agree (except possibly not with the "you need to choose a side" bit); my point is that people often *do act as if* the other side is always wrong, regardless of whether they actually *are*.
gollark: “We must oppose X because the outgroup supports it!”-type stuff instead of actually evaluating whether things are good ideas or not.
gollark: I'm not sure that's accurate, inasmuch as some of the time some sides don't actually appear to be acting according to whatever values are claimed.
gollark: I mean, food waste's not great, but it's not as if we could just conveniently ship it continents away to help people.

References
  1. Electronic Enlightenment Project (2008) Achille Pierre Dionis Du Séjour correspondence.
  2. "Fellow Details". Royal Society. Retrieved 20 January 2017.

 This article incorporates text from a publication now in the public domain: Bouillet, Marie-Nicolas; Chassang, Alexis, eds. (1878). "article name needed". Dictionnaire Bouillet (in French).


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