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Un planisphère de la planéte Mars en projection équiaréale

André Cailleux
Annales de Géographie
87e Année, No. 481 (Mai-Juin 1978), pp. 314-319
Published by: Armand Colin
Stable URL: http://www.jstor.org/stable/23450697
Page Count: 6
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Un planisphère de la planéte Mars en projection équiaréale
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Abstract

Previously, 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.

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