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In order to build the time zone map, they studied Earthâs movements. As the Earth rotates on its axis, it moves about 15 degrees every 60 minutes. After 24 hours, it has completed a full circle rotation of 360 degrees. The scientists used this information to divide the planet into 24 sections or time zones.Each time zone is 15 degrees of longitude wide.f we had one single time zone for Earth, noon would be the middle of the day in some places, but it would be morning, evening and the middle of the night in others.
Quick Answer. There are 24 different time zones in the world set at 15 degree longitude intervals in between. The Earth completes one full rotation in 24 hours at a speed of 15 degrees per hour. The premise behind time zones is that the world is theoretically divided into 24 equal longitudinal zones and the time is accordingly adjusted in each zone by an hour.