Editing Lagrange point (section)

==History==
The three collinear Lagrange points (L<sub>1</sub>, L<sub>2</sub>, L<sub>3</sub>) were discovered by the Swiss mathematician [[Leonhard Euler]] around 1750, a decade before the Italian-born [[Joseph-Louis Lagrange]] discovered the remaining two.<ref>{{Cite book |title=Dynamical Systems, the Three-Body Problem, and Space Mission Design |last1=Koon |first1=Wang Sang |first2=Martin W. |last2=Lo |author-link2=Martin Lo |first3=Jerrold E. |last3=Marsden |author-link3= Jerrold E. Marsden |first4=Shane D. |last4=Ross |url=http://www.cds.caltech.edu/~marsden/books/Mission_Design.html |date=2006 |page=9 |access-date=9 June 2008 |archive-url=https://web.archive.org/web/20080527145955/http://www.cds.caltech.edu/~marsden/books/Mission_Design.html |archive-date=27 May 2008 |url-status=dead }} (16MB)</ref><ref name="E327">{{cite book|author-link=Leonhard Euler|first=Leonhard|last=Euler |url=http://www.math.dartmouth.edu/~euler/docs/originals/E327.pdf |title=De motu rectilineo trium corporum se mutuo attrahentium |date=1765}}</ref>

In 1772, Lagrange published an "Essay on the [[three-body problem]]". In the first chapter he considered the general three-body problem. From that, in the second chapter, he demonstrated two special [[Three-body problem#General solution|constant-pattern solutions]], the collinear and the equilateral, for any three masses, with [[circular orbit]]s.<ref name="gallica.bnf.fr">{{Cite book |last=Lagrange |first=Joseph-Louis |author-link=Joseph-Louis Lagrange |title=Œuvres de Lagrange |date=1867–1892 |publisher=Gauthier-Villars |chapter=Tome 6, Chapitre II: Essai sur le problème des trois corps |pages=229–334 |chapter-url=http://gallica.bnf.fr/ark:/12148/bpt6k229225j/f231.image.r=Oeuvres+de+Lagrange.langFR |language=fr }}</ref>