# Joseph Louis Lagrange

## Personal Information

## Major Contribution to Physics

He contributed to making of the metric system and the decimal base. Wanting to solve isoperimetrical problems, Lagrange wrote a letter to Leonhard Euler explaining his discoveries in 1758. His early writings are in a 5 volume book called, “Miscellanea Taurinensia”. He came up with the method of isoperimetrical problems later known as “calculus of Variations”.

**Calculus of Variations- **** finds the curve or surface that maximizes or minimizes a given expression with restrictions on a desired curve **

He made a contribution to celestial mechanics, while understandiing the forces of Newtons Laws and corperating that with the study of the planets and space. He discovered the idea that as the moon goes around the earth the same side always faces the earth, because in a 2 body system such as the sun and earth the 3rd body, the moon, will remain constant.