古代一昼夜划为12个时辰,又划为100刻(“刻”原来指的就是计时的滴漏桶上的刻痕。一昼夜滴完一桶,划分为100刻)。“时”和“刻”实际上是两套计时系统单位,换算比较麻烦,平均每个时辰合八又三分之一刻。“午时”一般约合今天的中午11点至13点之间,午时三刻是将近正午12点,太阳挂在天空中央,是地面上阴影最短的时候。这在当时人看来是一天当中“阳气” The ancient day and night was divided into 12 hours, and it was marked as 100 moments (“engraved ” originally refers to the puncture on the hourglass drip bucket. After one night, one bucket was finished, divided into 100 moments). “Time” and “Engraved” are actually two sets of timekeeping system units, the conversion is more troublesome, and the average hour is eight and one-third. “Noon” is generally between today’s 11 noon and 13:00. At noon, it is nearly 12 noon. The sun is hung in the center of the sky. It is the shortest time on the ground. This was what people thought was “Yang Qi” during the day.