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为了克服采用地方时而造成的不同经度地方在时间上的混乱,统一时间标准,1884年在华盛顿召开的一次国际经度会议上,与会国家创立了在世界范围内应用的标准时间制度:规定每隔经度15°,划为一个时区,把全球按经度分为24个时区,各时区都以本区中央经线的地方时作为全区共同使用的时间,称为区时。相邻两个时区的区时,相差整一个小时,其中较东的时区,区时较早。但是,这是一种理论上的标准时制度。它仅因经度而不同,完全不考虑地球上的海陆分布和政治疆域,因而只适用于航海。而在实际上,不论是时区的划分或者是标准时的采用,各个国家和地区的做法是各不相同的。
In order to overcome the confusion of time and place of different longitudes caused by the use of local time, unified time standards, in an international longitude meeting held in Washington in 1884, the participating countries created a standard time system applied worldwide: the provisions of every longitude 15° is classified as a time zone, and the world is divided into 24 time zones according to longitude. Each time zone uses the time of the central area’s central meridian line as the common use time of the whole area, which is called time zone. The time difference between the two adjacent time zones is a whole one hour apart, with the east time zone being earlier than the time zone. However, this is a theoretical standard time system. It differs only by its longitude. It does not consider the land and sea distribution and political territory on Earth. It is therefore only applicable to navigation. In reality, regardless of the time zone or the adoption of standards, the practices of various countries and regions are different.