最早的原始人类无疑是从太阳的升起和降落,产生“日”的时间短周期,接着从月亮的圆缺总结出“月”的时间中周期。进入农耕社会以后,人类越来越多地从事农业生产,先民们根据天气冷暖交替的情况,需要确定一个农作物耕种到收获的时间长周期。日和月这两个时间周期是根据人类最熟悉的两个天体:太阳和月亮确定的,它们的长度很稳定。但是因为天气变化有较大的随机性,所以从世界各地考古发现,不管哪个地区、哪个古代部落,古人 The earliest primordial human beings undoubtedly came from the rising and falling of the sun, producing a short period of time of “day ”, and then summing up the period of time of “month ” from the full moon. After entering the farming society, human beings are increasingly engaged in agricultural production. According to the alternation of the weather, the ancestors need to determine the long period of time from a farming crop to harvesting. The two time periods, the day and the month, are based on the two celestial bodies most familiar to humans: the sun and the moon, and their length is stable. However, due to the greater randomness of weather changes, archaeological discoveries from all over the world, no matter which area, which ancient tribe, ancients