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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