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The shape of Planet Earth

Professor Etienne Ghys of the Unité de Mathématiques Pures et Appliquées de l'E.N.S. de Lyon gave a presentation in October 2006 to an audience of geologists on the historical mathematical approaches to determining the theoretical shape of the Earth. Professor Ghys and myself collaborated to produce the graphics for this presentation. The page below is a result of this collaboration. [from Mathematical imaginery by Jos Leys]
http://www.josleys.com/show_gallery.php?galid=313