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International date line by John The International Date Line is an imaginary line, which generally follows the 180-degree meridian of longitude. The date line marks the boundaries between calendar days.
Time zones are areas around the world that have adopted the same time. Time within a time zone is usually called “local time”. There are twenty-four major time zones around the world. Each time zone is usually separated by one hour.
In the United States, there are four time zones: Eastern, Central, Mountain, and Pacific.
The starting point for time zones is at England’s Greenwich Observatory. This point is also known as the Prime Meridian. Time zones were created to help travelers. Time zones also helped the railroad companies. Prior to the creation of time zones each city a train traveled through might have a different time. This created a hardship for travelers because they constantly had to reset their watches. It also made it impossible for the railroad to publish arrival and departure times.
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