Greenwich Mean Time (GMT) was created in 1675 to allow sailors to determine their position across the globe accurately. The development of transport and communication at the end of the 1820s necessitated the introduction of a uniform time reference for the whole earth: 24 time zones were designated. For Google Street View pull that small yellow man from the left side on the map. Scroll with your mouse to zoom, or use zoom buttons on the left side of the map. Move your cursor above the country you want to see current time for and click to view time zone and your actual time details. The map below shows the different time zones of the world. This means that if we travel through it in the east, we will lose one day, while we will gain one day to the west. The locations to the west are 24 hours ahead of the east of the line. On the opposite side of the Earth to the starting meridian, there is a date-line that runs mainly through the Pacific Ocean, avoiding the mainland. With summertime, countries reduce energy consumption because people use less electricity for lighting. This is called daylight saving time – one way to give people an extra day of sunshine in the evening. In Britain, for example, everyone sets their clocks one hour ahead. Some countries change their clock in the summer. Some areas, such as parts of India, Iran, and Australia, use non-standard half-hour deviations. For example, China could be divided into several time zones, but instead, the whole country uses the same time. Thus, for convenience, entire countries tend to adjust to the same local time rather than adjusting exactly to the zones. Governments can change their country’s time zone.
The zones measured according to the Greenwich Mean Time used as the starting meridian, that measured in hours before and after GMT. There are 24 different timezones, separated by one-hour intervals with each 15 degrees longitude. If someone is traveling by plane between two zones, he or she will adjust his/her clock to the one used in the new zone. Within each zone, people set their clock for the same time. The reason for this is that we divide the Earth into different time zones. When it is noon in Rio de Janeiro, it is midnight in Tokyo.
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