What is the relationship between the yellow calendar and the monthly calendar and the lunar calendar and the twenty-four solar terms?

Calendar in China can be divided into three types: solar calendar, lunar calendar and yin-yang calendar. The solar calendar takes the annual apparent movement period of the sun (i.e. the tropic year, equal to 365.2422 days) as a year, which is divided into 12 months, and has nothing to do with the movement of the moon. According to the strict date, we can know the changes of the four seasons from winter to summer, but it can't show the complete and short period of the moon, which is inconvenient for those who need to know the tidal changes according to the moon phases. ?

The lunar calendar takes the full period and short period of the moon (that is, the new moon, which is equal to 29.5306 days) as one month, and the product of 12 months is one year. It completely ignores the annual apparent motion law of the sun, so the date of the lunar calendar can't show the warmth and coldness of the four seasons. This kind of calendar has no practical value, and now it has been abandoned except Islam. ?

The lunar calendar, that is, the China lunar calendar, emphasizes the length of the solar calendar and avoids the shortness of the lunar calendar, taking the month of the lunar calendar as the month and the year of the solar calendar as the year, that is, taking the moon as the month and the tropic year as the average length of a year. Therefore, the lunar calendar is a solar calendar with elements of the moon and a lunar calendar with elements of the sun. According to the date of the lunar calendar, we can not only know the ebb and flow of tides, but also basically grasp the changes of seasons. The lunar calendar is an original creation of our country, which shines with the wisdom of our ancestors.

Twenty-four solar terms refer to 24 specific festivals in the China lunar calendar, which are formulated according to the change of the earth's position on the ecliptic (that is, the earth's orbit around the sun), and each solar term corresponds to a certain position reached by the earth every time it runs 15 on the ecliptic. Twenty-four solar terms are divided into 12 neutral solar terms and 12 solar terms.

Twenty-four solar terms is a unique creation of China calendar, which has played an important role in promoting the development of agriculture and animal husbandry in China for thousands of years. The names of solar terms first appeared in the Yin and Shang Dynasties, and were complete by the twenty-fourth solar terms in the Western Han Dynasty. With the spread of China calendar, the 24 solar terms spread all over the world.

China perpetual calendar