Question: What do timezones have to do with the rotation of the earth?
Answer (from library.thinkquest.org)
The rotation of the earth has an effect on how many time zones we have. 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. Here it is mathematically: 15 degrees x 24 hours = 360 degrees or 360 degrees/24 hours = 15 degrees.
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