Finding a Hidden Spot With Latitude and Longitude
Imagine you want a friend to find a hidden object on a globe. You cannot just say "somewhere near the middle." You need a system that gives every place its own address. Mapmakers solved this problem by drawing imaginary lines around the Earth.
Lines of latitude run east and west, like rings around the globe. The longest ring is the equator, which is marked zero degrees. Latitude tells how far north or south of the equator a place is. Lines of longitude run from the North Pole to the South Pole. The starting line, called the prime meridian, passes through Greenwich, England. Longitude tells how far east or west of that line a place is.
To find any spot, follow these steps. First, find the latitude on the side of the map and trace a line across. Next, find the longitude along the top or bottom and trace a line up or down. The spot where the two lines cross is your location. Write the latitude first, then the longitude.
These numbers are called coordinates. Sailors used them to cross oceans, and pilots still use them today. Your phone also uses them to show where you are on a map.