Jacques Eugène d'Allonville de Louville (14 July 1671 – 10 September 1732) was a French astronomer and mathematician.

As the youngest son, Jacques Louville was destined to the church; the other choices were a military career or another path which would not offend his elders.

He cut ties with the army and against the wishes of his family, returning his officer certificate and renouncing his appointments.

In 1715, Louville went to London to observe a total solar eclipse, assisting Edmund Halley.

The men saw on the dark surface of the Moon jets of light that lasted for an instant and passed.

Louville concluded in his measurements taken during his stay in Marseille ( watching the same stars that Pythéas had observed in the same city five centuries ago and those of other astronomers for century's had also observed) that the tilt on the axis of earth was not constant all the time.

This finding showed that in 23000 years the sun will be directed towards the equator and that in 2 million years all the climates around the world under the torrid zones and under the glacier zones will change” (Voltaire) Louvilles thesis explained mathematically by Euler, and accepted today, had a considerable echo but he was still challenged by other scientists.