The twenty-four solar terms of the lunar calendar jingle

The jingle of the twenty-four solar terms of the lunar calendar is that spring rains shake the spring and clear the valley, and summer is full of heat. Autumn dew, autumn frost, little snow in winter and cold in winter.

1. Lunar calendar

The lunar calendar, that is, the current traditional calendar in China, belongs to the yin-yang calendar, that is, the lunar calendar and the solar calendar. According to the change cycle of the moon phases, each moon phase changes to one month, taking the tropical year of the sun as the length of a year, and adding 24 solar terms and setting leap months to make the average calendar year adapt to the tropical year.

The current lunar calendar was renamed as "Summer Calendar" after 1970. Calculated by Purple Mountain Observatory of China Academy of Sciences, the national standard "Compilation and Promulgation of Lunar Calendar" was promulgated in 20 17.

Using the new calendar, the years are divided into flat year and leap year, flat year 12 months and leap year 13 months. Month is divided into big month and small month, with 30 days in big month and 29 days in small month, and the average calendar month is equal to the full moon.

The lunar calendar is based on the moon's profit and loss cycle. A new moon lasts for one month, about 29.53 days, and the whole year is generally 354 or 355 days, which is less than 365 or 366 days in the Gregorian calendar year (also known as tropic year and solar year) 1 1 day.

2.24 solar terms

Twenty-four solar terms are special festivals in the calendar to express the change of natural rhythm and establish "December architecture", which contains a long cultural connotation and historical accumulation and is an important part of the long history and culture of the Chinese nation.

Four years old, three months in spring, summer, autumn and winter, two solar terms each month, each solar term has its own unique meaning. Twenty-four solar terms accurately reflect the change of natural rhythm and play an extremely important role in people's daily life. It is not only a seasonal system that guides agricultural production, but also a folk system that contains rich folk customs.

Twenty-four solar terms are the product of ancient farming civilization, and are the knowledge system formed by ancient ancestors following the farming season and understanding the changing laws of seasons, climate and phenology in a year by observing the movement of celestial bodies.