How does Jiazi track the moon?

Because there are twelve months in a year, the moon is marked by Jiazi, and it takes five years to form reincarnation. Because every month's earthly branches are fixed in the shade as the first month, when we don't have a perpetual calendar at hand, we need to use a formula to calculate the heavenly dryness.

The formula is that the first year is Jiaxu, and the second year is the first. Bing Xin's position is from Geng, and his throne is downstream. Where does Pentecost begin? It is easy to infer from Jiayin. This Song formula is also called "five tigers hide the moon", which means: Jiaxu year is the first ",that is, every year is Jiayin year. The basis of this deduction algorithm is stated in Kao Yuan: "In the first year of the ancient calendar, both the month and the day started in Jiazi, which is the year of Jiazi, and November is also the winter solstice.

And in the first month, Yin was built, so Bing Yin was obtained. Laying eggs in February, counting in turn to the first month of the following year to get five yin, so the five yin began in the first month of the following year. It has been five years * * * June from A to B, which is a cycle, so the first month of the year is also C? Yes It should be noted that at the turn of the month, the "festival" in the twenty-four solar terms shall prevail, not the qi (), so the festival will be considered as entering the next month. In order to facilitate everyone's practice, the month and solar terms are listed at the top left.