Why is this year's "slight cold" the 23rd of the 24 solar terms?

Twenty-four solar terms are a traditional meteorological seasonal system in China, which divides a year into 24 solar terms according to the apparent operation of the sun. Each solar term is about 15 days apart.

"Slight cold" is one of the twenty-four solar terms, which usually appears on the fifth or sixth day of the Gregorian calendar 65438+ 10. However, due to the error of calendar calculation, there will be some deviations in the actual "slight cold" time every year. In addition, with the change of the earth's rotation speed and the distortion of the earth's orbit, the spring and autumn equinox will change every year, thus affecting the order and time of the 24 solar terms.

Therefore, although "slight cold" usually appears on June 5th or 6th and June 5438+10, it may appear earlier or later in some years due to the influence of calendar calculation and earth movement. This year (2023), the "slight cold" was at 65438+10.4, so it was the 23rd in 24 solar terms.