Editing Coordinate system (section)

==Geographic systems==
{{main | Spatial reference system}}

The Earth as a whole is one of the most common geometric spaces requiring the precise measurement of location, and thus coordinate systems. Starting with the Greeks of the [[Hellenistic period]], a variety of coordinate systems have been developed based on the types above, including:
* [[Geographic coordinate system]], the [[Spherical coordinate system|spherical coordinates]] of [[latitude]] and [[longitude]]
* [[Grid reference system|Projected coordinate systems]], including thousands of [[cartesian coordinate system]]s, each based on a [[map projection]] to create a planar surface of the world or a region.
* [[Geocentric coordinate system]], a three-dimensional [[cartesian coordinate system]] that models the earth as an object, and are most commonly used for modeling the orbits of [[satellite]]s, including the [[Global Positioning System]] and other [[satellite navigation]] systems.