The theme of the sun is omnipresent in the Corbusian poetry which devotes the Ville radieuse, the brise-soleil, the 24 hour sun or even the dictatorship of the sun. Beyond these rhetorical effects, the question of the sun offers a grille of transversal reading of Le Corbusier’s work. Three main periods can be identified. The first period stretches over until the end of the 1920s. The sun is to a large extent absent. The second period stretches over the beginning to the 1930s till the end of the 1940s. It is a period of research and solar experiments that articulate a double ambition. The third period finally is that which stretches to the end of the 1940s till the death of the architect. Le Corbusier with the aid of his exceptional collaborators finds the exact modalities of the establishment of the brise-soleil which becomes one of the fundamental elements of the plastic of projects.