Coordinates
In general coordinates
are numbers that locate an object. For locations
on the earth, these are commonly given as Latitude and Longitude.
These can be thought of as circles on the earth or as angles from
the center of the earth. This is true for a spherical earth, but is
slightly modified for the true elliptical shaped earth.
Keeping the latitude constant generates a line on the earth's surface parallel to the equator. These are called Parallels. Keeping the longitude constant generates lines called Meridians. The meridians all meet at the poles. The parallels never meet.
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