What kind of calendar was used in ancient China? When was the current lunar calendar adopted? Is the international calendar a solar calendar? What are its advantages?

China's calendar and calendar years adopt the three-in-one calendar of Yin and Yang; In ancient times, according to the needs of different agricultural and animal husbandry production, the solar calendar and the lunar calendar were produced respectively. As a traditional calendar in China, the lunar calendar has its earliest origin, and there are many records in ancient books, as well as in Oracle Bone Inscriptions and China. At present, it is generally believed that the calendar rule of the integration of yin and yang originated in the Yin and Shang Dynasties. There were 102 calendars in the history of China from the Huangdi calendar to the opening of the solar calendar in the late Qing Dynasty. Some of these calendars have had a great influence on China's culture and civilization, such as Xia calendar, Shang calendar, Zhou calendar, taichu calendar in the Western Han Dynasty, Dayan calendar in Sui and Tang Dynasties and Emperor calendar. Although some calendars are not officially used, they are of great significance to health, medicine, ideology and astronomy. The ancient calendar of China before the Han Dynasty took 366 days as a year, and the "leap month" was used to determine the four seasons and the end of the year. There are already time units of day, month, ten-day and hour, and the technology of yin-yang calendar is available; The motion laws of the five planets and the sun and the moon were observed, and the time difference was adjusted by "leap moon" and "subtraction". The implementation of the calendar has become a major event, and one of the main contents is to determine the four-hour age by leap month and the positive leap surplus, that is, to determine the position of leap month and how to subtract the extra days (without missing days), so as to determine the end and start of the age. During the Spring and Autumn Period and the Warring States Period, due to the decline of the royal family in the Zhou Dynasty, the governors went their own way, so a multi-track calendar appeared, that is, the governors and local tribes also had their own local calendars; The Qin Dynasty is the last calendar in the history of China, which takes the four seasons of leap month as the calendar year.

At the beginning of Han Dynasty, there was a major turning point in China calendar, and the national unified calendar became a relatively independent science and technology. Emperor Wu instructed Sima Qian and others to write taichu calendar, and then Liu Xin wrote three calendars. The important feature of these two calendars is the integration of calendar and year. The whole number of days in a year is 365 days instead of 366 days in the previous calendar. Using "addition" instead of "subtraction" to adjust the time difference, the beginning of the age cycle is quite fixed, and leap months can be determined through mathematical calculation, without the need to "check the calendar and establish five elements" At this point, Yin-Yang and Five Elements basically withdrew from the calendar. Since then, the calendars promulgated by China in past dynasties have been similar to the taichu calendar law. After the founding of the Republic of China, the Gregorian calendar or the calendar year of the Republic of China was adopted.