# How Many Time Zones Are There on Earth?

The earth rotates every 24 hours which is why we have 24 hours in a day. We also have 24 time zones, each time zone stands for one hour. There are 360 degrees in a circle so it is 360 degrees around the earth. If we chopped the earth into hunks of 24, since there are 24 hours in a day, we would end up with each chunk being 15 degrees. Each time zone is 15 degrees wide at the equator. Time zones help us tell time. Humans designed time zones to help tell time. The rotation of the earth tells us if it is day or night. We decided to have time zones to make it easier.The rotation of the earth has an effect on how many time zones we have.
Q&A Related to "How Many Time Zones Are There on Earth"
 Since 1919, Russia has had eleven time zones. These zones span from Kaliningrad to Kamchatka. Many Russian officials believe that eleven zones are too many, and there is a possibility http://www.ask.com/web-answers/Science/Other/how_m...
 24. Actually, there are 40, not 24. Time zones tend to follow the boundaries of countries and their subdivisions, not 15 degree meridians. http://wiki.answers.com/Q/How_many_time_zones_does...
 There are 40 time zones on Earth - see the link. A few of them are hardly used at all. Most are about 1667 km wide, some are half of that, and a few are 1/4 of that. Source(s) http: http://answers.yahoo.com/question/index?qid=201310...