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Grand cercle

Définition

Un grand cercle est tout cercle sur une sphère dont le centre coïncide avec le centre de la sphère, représentant le chemin le plus court possible entre deux points à la surface.

Explication

On Earth, great circles include the equator and all lines of longitude. A flight from Los Angeles to London appears to arc northward over Greenland on a flat map — that path is actually shorter than flying due east because it follows a great circle. The concept is essential to aviation route planning; flying a great-circle route between distant cities can save hundreds of kilometers and significant fuel.

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