Étienne-Hyacinthe de Ratte (1722, Montpellier – 15 August 1805) was an 18th-century French astronomer and mathematician.
[1] De Ratte made some verses in his youth, but he soon turned away from his natural tastes to engage with ardor in the study of mathematics.
At twenty-one, he was secretary of the Académie des sciences et lettres de Montpellier [fr].
De Ratte also wrote a number of contributions to the Encyclopédie on physical issues such as froid, glace, gelée, etc.
In this discipline, he made a large number of observations, such as the Venus transit on 6 June 1761.