In geography, a time zone is each of the 24 areas in which the Earth is divided, by a meridian and in which the same schedule governs by convention. They are so named because the demarcated area has the shape of a spinning spindle, centered on the meridian of a length that is a multiple of 15 °. Previously, the true solar time meridian was used, so that the difference between one city and another was of a few hours, in the case that the cities compared were not on the same meridian. The use of the time zones partially corrected the problem, when the clocks of a region sound at the same time solar medium. All the time zones are defined in relation to the so-called coordinated universal time (UTC), time zone centered on the meridian of Greenwich or also known as zero meridian, which receives that name by passing through the Royal Observatory of Greenwich, in Greater London.
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Since the Earth turns from West to East, when going from one time zone to another in the east, one hour must be added. On the other hand, when going from East to West, one hour must be subtracted. The 180 ° meridian, known as the international date line, marks the change of day.
In countries whose geography develops in the direction of length, more than one schedule is imposed. Because of the time zones and the rotation of the Earth, the first places that receive the New Year are the Caroline and Kiritimati Islands, while American Samoa, Alofi Island, Baker Island and Howland Island are the last places.
Time zones are areas of the Earth that follow the same definition of time. Previously, people used the apparent solar time, causing time to vary slightly from town to town. The time zones partially rectified the problem by synchronizing the clocks of a region at the same time real solar. Time zones are generally centered on meridians of a length that is a multiple of 15 °; However, the forms of the time zones can be quite irregular because they adapt to the limits of the countries. All time zones are defined in relation to Coordinated Universal Time or UTC.
A time slot also known as time zone, is each of the 24 parts of 15 ° longitude in which the Earth divides by means of meridians and beginning in the meridian of Greenwich. Since the Earth turns west to east when going from one time slot to another in the east, an hour should be added. On the other hand, when going from west to east, one hour would have to be subtracted. On meridian of 180 ° The international line of date change is marked. Although they are usually used as synonyms, time zone and time zone are not exactly the same. The time zone (or time zone) fits within the meridians, while the time zone is the region through which the same time extends. Thus, a country can have territories in two time zones but be governed by the same official time, or be in a time zone but be governed, officially, by an hour or so. This is the case of Spain that is in the UTC time zone that marks the zero meridian, but is governed by the CET time, which is UTC + 1.
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