Achille Pierre Dionis du Séjour
Achille Pierre Dionis du Séjour was a French astronomer and mathematician.
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. 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, with Mathieu-Bernard Goudin
- Recherches sur le gnomonique et les rétrogradations des planètes,
- Traité des mouvements apparents des corps célestes,
- Essai sur les comètes
- Essai sur les disparitions périodiques de l'anneau de Saturne,