古人根据太阳出没的自然规律、天色变化及日常生产生活习惯,将一昼夜平均划分为十二个时段,每个时段叫一个时辰,相当于现在的两个小时,且每个时辰都有其特定名称。这些名称从周代起沿用已久,但直到汉代实行了太初历,才基本固定下来。夜半:又称“子夜”、“中夜”等,即现在的23点至1点 The ancients according to the natural law of the sun, the sky changes and daily production and living habits, the day and night will be divided into an average of twelve hours, each hour called an hour, equivalent to the current two hours, and each hour has its own specific name . These names have been in use since the Zhou dynasty, but they were not basically fixed until the early Ch'ing dynasty was practiced in the Han Dynasty. Midnight: also known as “midnight ”, “midnight ” and so on, that is now 23:00 to 1:00