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时间是怎样确定的?时间由谁来守护?为什么世界各国对是否使用“闰秒”争论不休?最大的时钟每当收音机或电视机传出“嘟、嘟……”的报时声时,人们都会习惯地以此校对自己的钟表的快慢。你有没有想过,这一正确的时间是从哪里来的?它是由设置在天文台的精密时钟控制的。那么,天文台又是怎样知道精确时间的呢?我们都知道,地球每天自转一周,因此,在地球人看来,天上的星星每天东升西落一次。如果把地球当做一个大钟,天空中的星星就好比钟面上表示钟点的数字,而星星的位置天文学家早已精确测定。
Time is determined? Time who guard? Why countries around the world whether to use “leap second ” endless debate? The largest clock whenever the radio or television outgoing "beep, beep ... When people are accustomed to proofreading the speed of their watches. Have you ever wondered where this right time came from? It is controlled by a precision clock set at the observatory. So, how does the observatory know the exact time? As we all know, the Earth rotates one day a day. Therefore, to the Earth people, the stars in the sky rise and fall daily. If you think of the earth as a big clock, the stars in the sky will be like numbers that indicate the hour on the clock, and the position of the stars astronomers have long been accurately measured.