Jérôme Lalande
Jérôme Lalande recommended her along with the mathematician Alexis Clairaut to calculate the predicted return of Halley's Comet, as well as to calculate the attraction of Jupiter and Saturn of the Halley's comet. The team worked on the calculations for more than six months straight, barely stopping for food. In November 1758, the team presented their conclusion that the comet would arrive on 13 April 1759. They were almost correct, as the comet arrived on 13 March 1759. As a result of their calculations, this was the first time scientists had successfully predicted when the comet would cross the perihelion, i.e. the point of the comet orbit closest to the Sun. Clairault did not recognize her work at all in his work, which upset Lalande who considered Lepaute the "most distinguished female French astronomer ever." Jérôme Lalande acknowledged her help in an article.