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妙妙常听妈妈感叹:“太阳落山了,一天又过去了。”太阳东升西落就是一天吗?古代的人是如何计时的呢?带着疑问妙妙和蒙蒙博士一起乘坐时光穿梭机,去探索古人计时的奥秘。在时光穿越之前,蒙蒙博士向妙妙解释了现代计时法。我们现代生活采用的是国际标准时间系统24小时计时法,把每天从午夜到午夜共分为24个小时,用数字0至23(24是每日完结的午夜)来表示。午夜12点是一天的开始,也是前一天的结束。1天的24小时又分为两段,每段12小时。从午夜12点起到中午12点叫做上
Miao Miao often listen to her mother sighed: “The sun goes down, one day has passed. ” The sun is rising east and west falling is the day? How ancient time is it? With the wonderful Miao and Dr. Meng Meng time shuttle , To explore the mysteries of ancient timekeeping. Before the passage of time, Dr. Meng Meng explained the modern method of timing. Our modern life uses the 24-hour time system of the International Standard Time system, which divides the daily hours from midnight to midnight into 24 hours and numbers 0 to 23 (24 are the midnight ends of the day). 12 o’clock midnight is the beginning of the day, but also the day before the end. 24 hours a day is divided into two sections, each 12 hours. From midnight to 12 noon is called on