What is the difference between the Gregorian calendar and the lunar calendar

Origin and development: The Gregorian calendar originated from the Julian calendar in the ancient Roman period, and was reformed by Pope Gregory XIII to form the current Gregorian calendar system, which is an internationally standardized calendar and is mainly used for daily life and international communication. The Lunar Calendar, a traditional Chinese calendar whose origins can be traced back to the Xia Dynasty, is a yin and yang calendar based on the law of the moon's motion around the earth, with the addition of leap months and the twenty-four solar terms added to accommodate the earth's cycle of revolution around the sun.

Time base: The Gregorian calendar is based on the cycle of the Earth's revolution around the Sun, and the year is divided into 365 days (flat year) or 366 days (leap year). The lunar calendar is based on the cycle of the moon's rotation around the earth, a month (solstice) is about 29.5 days, the lunar calendar has a big month of 30 days, a small month of 29 days, the whole year is generally 354 days or 355 days.