When did the Gregorian calendar spread to China?

19 12 The Republic of China decided to adopt the "Gregorian calendar", that is, the Gregorian calendar era. China's ancient calendar is a combination of yin and yang, heavenly stems and earthly branches's calendar is a part of the solar calendar, and the 24 solar terms are the core of China's lunar calendar, which are divided into 12 solar terms and 12 neutral terms. The solar term is the first day of each month, and neutral terms are related to lunar leap months, which is called "leap without neutral terms".

At present, the calendar used in most countries is called "Gregorian calendar" for short. Yes 1582 and 10 for two months. Pope Gregory XIII ordered the direct cutting of 10 days, and 10 months later it was 65438.

Our current lunar calendar began to be used in 1645, and the principle of changing the calendar is to learn from the new calendar of the western calendar. Xu Guangqi, one of the makers of calendars, is a Catholic. The calendar was revised at the end of the Ming Dynasty, but before it was implemented, the Ming Dynasty ended. It was not until the second year of Shunzhi in Qing Dynasty, that is, 1645 began to be implemented. The vernal equinox, autumnal equinox, summer solstice and winter solstice are redefined, and then the positions and dates of 24 solar terms on the ecliptic are re-established. This calendar change is also the last calendar change of China's calendar method.