How can we calculate solar terms without adopting the method of AD chronology in China?

Lunar calendar is a traditional calendar in China, also known as summer calendar, middle calendar, national calendar and commonly known as lunar calendar. The method of determining the month is given by the cycle of the first month of the lunar calendar. The first lunar month is the first lunar month, and the first lunar month is about 29 and a half days, so the first lunar month is 30 days and the second lunar month is 29 days. There are 12 months in the lunar calendar, 354 days or 355 days in the whole year, and 13 months in leap years. One month is a leap month, and the name of the month depends on the name of the previous month, such as August of the previous month and the leap month in August.