When will the festival be changed to the moon?

The solar terms change from month to month, and the solar terms become general. The whole refers to the measurement and observation of the monthly operation law when the solar terms change.

(1) The monthly general is determined by the method of fixed monthly construction, that is, the "festival" is changed to the general.

(2) The traditional method is adopted to determine the month, that is, the changing law of "Qi" in the 24 solar terms is strictly followed and the "Qi" is changed. Both of the above methods admit that "the moon will be an earthly branch that coincides with the moon structure".