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geographical pole
A geographical pole is either of the two points on a planet, moon, or other relatively large rotating body where the body's axis of rotation meets its surface. As with Earth's North and South Poles, they are usually called that body's "north pole" and "south pole", one lying 90 degrees in one direction from the body's equator and the other lying 90 degrees in the opposite direction from the equator. Every planet has geographical poles.
Perturbations in a body's rotation mean that geographical poles wander slightly on its surface. The Earth's North and South Poles, for example, move by a few metres over periods of a few years. As cartography requires exact and unchanging coordinates, the averaged locations of geographical poles are taken as fixed ''cartographic poles'' and become the points where the body's great circles of longitude intersect.
If, like the Earth, a body generates a magnetic field, it will also possess magnetic poles.
==See also==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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