Latitude and longitude — Geography, 14–17 years
A coordinate system gives every place on Earth a position that can be shared accurately. Geography, 14–17 years.
The Earth’s address system
Latitude and longitude form an invisible grid around Earth. Latitude tells how far north or south a place is from the Equator; longitude tells how far east or west it is from the Prime Meridian. Together, the two numbers act like a precise address for a place.
Why coordinates were needed
Saying “the island near the coast” is not enough when ships, aircraft or rescue teams need the same place. Mapmakers created lines of latitude and longitude so locations could be recorded and found consistently. Longitude became especially important for navigation across oceans, where there are no nearby landmarks.
Reading a coordinate
Take London at about 51.5° N, 0.1° W. First, 51.5° N places it north of the Equator, at roughly the latitude of southern England. Next, 0.1° W places it just west of the Prime Meridian. The pair identifies London far more precisely than its country name alone.
Latitude and longitude get swapped
A common mistake is to read 51° N, 0° W as longitude first, or to call both values “latitude”. This is understandable: both are measured in degrees and both appear as lines on a map. Remember the picture: latitude lines run across the map like belts, while longitude lines run from pole to pole.
Coordinates beyond the atlas
Your phone uses coordinates to show your position, guide a route and tag a photo. Emergency services can send help to a precise point, while weather satellites report conditions at particular locations. Scientists also use coordinates to compare measurements from different places without confusing one site with another.
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