How many time zones are the in the world?
A calendar day begins at midnight. But when it is midnight in New Zealand, it is high noon in London. In Tokyo, it is nine in the morning when the clocks of Rio de Janeiro say it is nine in the evening. The time zones were planned to settle this global confusion of the clocks. The world’s time zones are based on circles and every circle is divided into 360 equal degrees. As the earth rotates around its axis, it too circles through 360 degrees. It rotates once in 24 hours, so in one hour it rotates through 15 degrees of a Circle. Each time zone is planned to account for one of the 24 hours of a calendar day. If you guessed that the world has 24 time zones, you would be right. Time creeps westward and each zone is one hour ahead of the zone to the west and one hour behind the zone to the east. The lines between the zones are planned to follow the lines of longitude that run from pole to pole. If a zone line ran through a big city, the people to the west would be an hour behind those in t
