Chang's related history

The combination of yin and yang is convenient for people to use. According to the solar terms in the solar calendar, the time is known according to the months in the lunar calendar when farming. However, there is a very troublesome thing, that is, the running cycles of the sun and the moon are uneven and cannot be agreed. It takes about 365 days for the sun to go around the earth, while it takes about 28 days for the moon to go around the earth, with more than 10 days a year. If you don't adjust it, it won't be long before it will lead to seasons and months. The solution to this problem is to set a leap, that is, every few years (three years), add a month to the twelve months of a year, which is called a leap month. Having said that, we can understand why Luna is often called "the mother of the moon", because she is often responsible for making lunar months, so she must ensure that lunar months can be coordinated with solar seasons, that is to say, to reconcile yin and yang, so she takes the name of "female harmony".

Shan Hai Jing said: "There is a country with women and a country with mothers. ..... intercept the sun and the moon in the northeast corner, so that they do not appear alternately, and they are short and long. " That's what I'm saying. Northeast China is equivalent to the end of a year in time, and the accumulation of the running situation of the sun and the moon in a year. Setting a leap month (the first generation of leap month is set at the end of the year, called March) to synchronize the sun and the moon is called "making it invisible". It can be seen that Chang is still engaged in the work of maintaining the order of the universe, so he also belongs to the god of creation.