Did China live according to the lunar calendar or Gregorian calendar in ancient times?

In ancient times, the lunar calendar was also called the lunar calendar. It is based on the moon's ebb and flow cycle, which is about 29 days, 12 hours, 44 minutes and 4 seconds. So the big moon has 30 days and the small moon has 29 days. The real lunar calendar has only 354 days a year, which is 1 1 day less than the solar calendar (that is, the Gregorian calendar). In order to keep up with the changes of the weather, every two or three years, we have to add one more month, which is the so-called "leap month". Lunar leap month is not to adjust the date gap between lunar calendar and Gregorian calendar. At that time, there was no Gregorian calendar, and there would be one more day in February and April of the Gregorian calendar, which was the same as the leap month of the lunar calendar. Lunar leap month means that the solar calendar was also used in ancient times. How did you come to this inference? I really admire it.

In order to fully reflect the change of seasonal climate, as early as the Zhou Dynasty and the Spring and Autumn Period, ancient astronomers used the method of "returning to the earth" to determine the vernal equinox, summer solstice, autumn equinox and winter solstice, and divided the year into 24 equal parts according to the position change of the sun on the ecliptic and the evolution order of the ground climate caused by it, and named each equal part, which is the origin of the 24 solar terms. This date is basically fixed on the current Gregorian calendar, because the Gregorian calendar is also calculated according to the movement of the sun. Foreigners use this to achieve the same goal as us, not to say that we ancient people can't do without the Gregorian calendar.