What is the rule of 20 14 solar terms?

Hello, the rules are the last two of the solar terms in the Song Dynasty: the so-called first half is June 2 1 day, and the second half is August 23, which means: 65438+1October-June is the first half; July-65438+February is the second half year. Every 6th and 2 1 day in the first half of the year must be a solar term, and the 8th and 23rd of each month in the second half of the year are a solar term. There is usually a difference of one or two days. (all are Gregorian calendars)