To avoid confusion. Until the 19th century, the people of each region hit the watches observing the position of the sun throughout the day. So there were many time variations and it was difficult to know the right time elsewhere in the world. In 1884, a world conference was carried out and was decided that there would be a reference line the Greenzich meridian in England. Then the earth was divided into 24 hourly spindles. Each of them represents the difference of an hour m, for the least. Ex: When in Brazil is 3 hours in the afternoon, in Portugal are already 7 hours at night.

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