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1、地球是个不透明的球体,在同一时间里,太阳只能照亮半个球面,对着太阳的的一面是白天,背着太阳的一面是黑夜。由于地球不停地从西向东绕轴自转,东边的地方总比西边的地方早看见太阳。人们又把太阳在天顶的时刻定为正午12时,所以在同一瞬时里,地球上不同经度的地方就有不同的时刻。为了避免这种时刻差异给现代生产和生活造成混乱,国际上规定以划分时区的办法,来确定各地的区时,使地球表面一定的
1. The earth is an opaque sphere. At the same time, the sun can only illuminate half a sphere, the side facing the sun is daytime, and the side that carries the sun is night. As the earth rotates around the axis from west to east, the place on the east always sees the sun earlier than on the west. People once again set the sun’s zenith time at 12 noon, so in the same instant, there are different moments in different longitudes on Earth. In order to avoid the confusion caused by this time difference in modern production and life, international regulations stipulate the method of dividing the time zone to determine the time of each place so that the surface of the earth is certain.