Traditional Culture Encyclopedia - The 24 Solar Terms - When are spring and summer?
When are spring and summer?
Spring ranks first among the four seasons, and a new cycle begins. Spring represents warmth, growth, plant germination, warm weather and flowers. The temperature, sunshine and rainfall in this season are at the turning point of the year, and there is a rising or increasing trend. In spring, the qi of yin and yang begins to change, and everything germinates and grows with the rise of yang. Spring is the season for all things to grow and sow. The so-called "one year's plan lies in spring".
periodical change
In ancient times, the direction of bucket handle determined the alternation of seasons, and the Big Dipper rotated in a circular way, which was closely related to the change of seasons. The current "twenty-four solar terms" come from the "fixed gas method" concluded more than 300 years ago (it has been used since 1645). "Constant Qi Method" is a method to determine solar terms according to the position of the sun on the ecliptic.
That is to say, on a "ecliptic" with a circumference of 360 degrees (the apparent path of the sun on the celestial sphere for one year), it is divided into 24 equal parts, one for each 15. Although the twenty-four solar terms were formulated by the ancients according to the Big Dipper, in fact, the reason for the star shift is that the earth revolves around the sun, so the time of the two festivals is basically the same.
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