There will be a summer calendar and a weekly calendar in the Book of Songs. What are the differences and connections between them?

In many pre-Qin ancient books, the calendar system is not unified. For example, Spring and Autumn Annals and Mencius use the weekly calendar; Chu Ci and Lv Chunqiu use the summer calendar, and The Book of Songs depends on specific articles. Xiaoya uses the summer calendar in April, and Qi Feng uses the summer calendar in July. The weekly calendar and the lunar calendar are used together.

? Because there are many calendars in July in The Book of Songs, it shows several calendars in ancient China. If you don't understand the existence and relationship of these calendars, it is difficult to understand this classic. To interpret the classics, we must grasp every nuance and subsequent background. The Book of Songs in July grasps the calendar. This is an important breakthrough. Compared with today's calendar, it is difficult to understand the time and season. Calendar has been following the continuation of the whole human race, and we have been following the calendar. As the common sense of China's ancient culture, we naturally have to master the calendar.

? With regard to calendars, there is now the saying of "ancient six calendars", which refers to six calendars formulated in the Spring and Autumn Period, the Warring States Period and the Qin Dynasty, including Huangdi calendar, Zhuan Xu calendar, Xia calendar, Yin calendar, Zhou calendar and Lu calendar. This is the earliest calendar in China. July in The Book of Songs reflects three calendars, namely, the weekly calendar, the summer calendar and the lunar calendar. The following is an analysis of China's ancient calendar from the perspective of self-knowledge. First of all, talk about the calendars of Zhou, Yin and Xia San and the "three rectifications".

The summer calendar is one of the six ancient calendars in China. It is said that this calendar originated in the Xia Dynasty. The original calendar rule has been lost. At present, we only know some contents from some ancient books: the month from the winter solstice is the next month as the calendar year, and the calendar year begins with the establishment of silver moon, namely Andrew (hereinafter referred to as Xia Zheng), and the whole number of 366 days is roughly adopted as one year, and the time difference is adjusted by subtraction and positive leap surplus. The summer calendar adopts the method of "fixing the new moon"-taking the new moon as the first day of each month.

The average calendar month is equal to a moon, which is the same as the lunar principle, so it has lunar elements; On the other hand, the leap month is set, so that the average calendar year is the tropic year, and 24 solar terms are set to reflect the changing characteristics of the seasons (the annual movement of the direct point of the sun), so there is also a solar calendar? It not only reflects the influence of the sun's thermal action on the earth, but also reflects the periodic change of the moon as the main factor and the tidal force of the sun on the earth. It is a treasure of China's traditional culture? .