Grade two Chinese textbook 24 solar term song

Spring rain surprises spring and bright valley days, and summer is full of mans and summer heat is connected;

Autumn dew, autumn frost, little snow in winter and cold in winter.

There is no change in the two festivals every month, with a maximum difference of one or two days;

The first half of the year is June 2 1 day, and the second half is August 23.

Extended data

Agricultural production is closely related to the rhythm of nature. It is a knowledge system formed by ancient ancestors by observing the movement of celestial bodies and understanding the changing laws of time (season), climate and phenology in a year. Twenty-four solar terms were originally formulated according to the changes of stars, and the Big Dipper rotates circularly, which is closely related to the changes of seasons.

Polaris is located at the northern end of the earth's axis, which is five times as long as the extension line connecting Tian Xuan and Shu Tian in the Big Dipper. Because of the earth's rotation, Polaris is just on the axis of celestial rotation, so it is relatively static, while the Big Dipper on the axis seems to revolve around Polaris, resulting in a "star shift".

The Big Dipper is an important astrology in the northern hemisphere (China is located in the northern hemisphere), and the natural rhythm of the corresponding area in the northern hemisphere gradually changes when the stars turn, so it became the basis for the ancients in China to judge the change of solar terms, that is, the so-called "bucket handle refers to the east, and the world is spring; Guide to barrel handle, it's summer in the world; Bucket handle refers to the west, and the world is autumn; Bucket handle refers to the north, and the world is winter. ".