When you travel or west to a different country, you have to change the time on your watch. This happens because the Earth turns, so when it is day-time in some parts of the world, it is night-time in others.
We divide the Earth into 24 time zones, ond for each hour of the day. All the places in the same time zone have the same time. We start counting from Greenwich, England. When it is 12 pm in Greenewich and you travel eats to a place in the next zone, Rome for example, it is 1 pm. If you travel west to a place in the next zone, Azores for example, it is 11 am.
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