A geographical pole
is either of the two points on a rotating body (planet
, dwarf planet
, natural satellite
, sphere...etc) where its axis of rotation
intersects its surface.
As with Earth
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. If, like the Earth, a body generates a magnetic field, it will also possess magnetic 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.
This page was last edited on 15 December 2017, at 04:00.
under CC BY-SA license.