Why does the 24 solar terms run for 360 days instead of 365 days, and the earth goes around the sun for 365 days? What is the inconsistency between the change of solar terms and the revolution of the

Why does the 24 solar terms run for 360 days instead of 365 days, and the earth goes around the sun for 365 days? What is the inconsistency between the change of solar terms and the revolution of the earth? The 24 solar terms do not run for 360 days, which is related to the year of the tropic of cancer. A tropical year is 365.2422 days, which is equal to the change period of the direct point of the sun and the time for any solar term to reach the same solar term in the next year. Also note that the solar term is actually a moment, not a day.

The tropic year is not equal to the period of revolution of the earth. The real period of revolution of the earth is a sidereal year, which is slightly longer than the tropic year, with 365,564 days. The difference between them is called precession, which is caused by the precession of the earth axis and the westward movement of vernal equinox.

The length of a year in the current calendar is calculated according to the tropic year, which is not equal to the time for the earth to go around the sun once. Because the weather and climate on the earth are related to the movement of the direct point of the sun, the tropic year is chosen to make the date better correspond to the cold and warm weather and better guide agricultural production and people's lives.