Latitude

 distance north or south from the equator measured in degrees 

Longitude

 distance measured by degrees or time east or west from the prime meridian 

_{Prime meridian}

 the meridian of 0° longitude from which other longitudes are calculated 

Equator

an imaginary circle around the earth everywhere equally distant from the north pole and the south pole 

 International Data line

 an imaginary line along the 180th meridian named as the place where each calendar day begins 

Global Positioning system

a navigation system that uses satellite signals to find the location of a radio receiver on or above the earth's surface