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Latitude and Longitude 

 

Latitude is the distance north or south of the equator measured in degrees, in parallel lines around the earth. Lines of longitude are drawn from the North to the South Pole, and they measure the distance in degrees east or west of an imaginary line called the prime meridian that runs through Greenwich, England. Each degree is broken down into 60 minutes. A latitude of 28 degrees 30 minutes is written as 28° 30'.

The lines of latitude and longitude form a grid, which makes it easy to locate any place on earth. You can compare it to finding a seat in a stadium, in which the cross rows are like latitude lines and the up-and-down aisles are like longitude lines.

Check that you understand what these words mean in this document
Grid: a system of squares.
Aisle: the free space between sections of seats where people walk.