The time shift results from the unevenness of the earth's rotation. In countries that use the summer-winter time to save energy, local time varies by + 1 hour in summer. At the end of the 19th century, the earth was divided into 24 time zones, each of 15 degrees longitude, and on the opposite side of Greenwich South Circle, an international date-line was designated.įor practical reasons, the boundaries of the zones have adapted to geographical and political boundaries, many of which have involved changes in time zones. 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. Some time zone maps will also include information about daylight saving time, which is a system that adjusts the standard time in some regions to make better use of daylight during the summer months. The map will also typically show the boundaries between the time zones and indicate the standard time that is used in each zone. The different time zones are usually represented by different colors or shading on a time zone map. Time zones tend to follow lines of longitude because the Earth rotates on its axis, and different parts of the Earth are exposed to sunlight at different times of the day. Time zones are regions of the Earth that have adopted the same standard time, usually for the purpose of coordinating activities such as transportation, communication, and work. Time zone mapĪ time zone map is a map that shows the division of the Earth into different time zones. For Google Street View, pull that small yellow man from the left side of the map. Scroll with your mouse to zoom, or use the zoom buttons on the left side of the map. Move your cursor above the country you want to see the current time for and click to view the 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, a date-line runs mainly through the Pacific Ocean, avoiding the mainland. It’s important to note that the dates and times when DST begins and ends can vary from country to country, so it’s always a good idea to check the local time and whether or not DST is in effect when traveling to a new location. In Canada, DST begins on the second Sunday in March and ends on the first Sunday in November, with some exceptions. In the European Union, DST begins on the last Sunday in March and ends on the last Sunday in October. In the United States, for example, Daylight Saving Time begins on the second Sunday in March and ends on the first Sunday in November. However, not all countries observe DST, and the dates when it begins and ends can vary from place to place. Many countries around the world observe Daylight Saving Time (DST), also known as “summertime.” Some countries that observe DST include the United States, Canada, Mexico, most of Europe, parts of South America, and some countries in Asia and Africa. The specific dates when Daylight Saving Time begins and ends, and the amount of time that the clock is adjusted, can vary depending on the location. The purpose of Daylight Saving Time is to make better use of the available sunlight during the longer days of the summer by shifting some of the daylight from the morning hours to the evening hours. This is done by moving the clock ahead by one hour at a specified time in the spring and then moving it back by one hour at a specified time in the fall. In the context of time zones, “summertime” typically refers to Daylight Saving Time ( DST), which is the practice of setting the clock ahead by one hour during the summer months in order to extend the amount of daylight in the evenings. 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 were measured according to the Greenwich Mean Time, used as the starting meridian, which measured hours before and after GMT. There are 24 timezones, separated by one-hour intervals, with each 15 degrees longitude. If someone travels 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. This is because 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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