Time Zones

Time zones are sections of the Earth where everyone uses the same time on their clocks. The Earth is divided into 24 main time zones. As you move east or west, the time changes. This system makes sure that noon happens when the sun is highest in the sky wherever you are.

Why We Have Time Zones

The Earth spins around once every 24 hours. As it spins, different parts face the sun. When it is daytime where you live, it is nighttime on the other side of the world. Time zones were created so clocks would match the sun in each area.

Time Zones in the United States

The United States has six main time zones. The Eastern time zone includes New York. The Central time zone includes Chicago. The Mountain time zone includes Denver. The Pacific time zone includes Los Angeles. Alaska and Hawaii each have their own time zones.

Fun Facts

• Before time zones, each town set its own clocks by looking at the sun.
• China is so big it could have five time zones, but the whole country uses just one.
• Russia has 11 time zones, more than any other country.

Did You Know?

Time zones were first used by railroads in the 1880s because trains needed a standard schedule!