Annales de Géographie - Année 1978 - Volume 87 - Numéro 481 - Pages 314-319Previously, most maps of the Moon and the planets were made in a perspective, so-called orthographic projection. They are neither equal-area nor conformal. Fortunately enough we are able to make other kinds of maps. For the Moon and the planets, most of them are conformal. But for some purposes equal-area maps are necessary. And as everyone knows, no projection can be both conformal and equal-area. The map of Mars published by U.S.G.S. (United States Geological Survey) is a wonderful document, in conformal projection. On the base of this document, I prepared a planisphere of Mars in the equal-area Mollweide projection (Fig. 1). Now, I think that the equal-area Hammer-Aïtoff planisphere might be even better because the polar and equatorial regions are less deformed, and the curved parallels better suggest to the eye the spherical form of the planet. 6 pages Source : Persée ; Ministère de la jeunesse, de l’éducation nationale et de la recherche, Direction de l’enseignement supérieur, Sous-direction des bibliothèques et de la documentation.