How many versions of the Gregorian calendar are there?

There are three versions of the yellow calendar, namely, the folk yellow calendar, the official yellow calendar and the lunar calendar.

1. Popular almanac: Popular almanac is the most common version of the almanac, which is usually published by folk media or publishing houses, including heavenly stems and earthly branches, solar terms, festivals, good or bad luck, taboos and other information. It is one of the calendar tools commonly used by the people.

2. Official almanac: Official almanac is a kind of almanac formulated by the Chinese Astronomical Society. Its content is more accurate and scientific than the popular Gregorian calendar, mainly including astronomy and meteorology. Official yearbooks are usually published by the Chinese Astronomical Society.

3. Lunar yellow calendar: The lunar yellow calendar is a kind of yellow calendar compiled according to the traditional Chinese calendar in China, which includes information such as heavenly stems and earthly branches, solar terms, festivals, good luck and taboos, and is similar to the popular yellow calendar. Lunar calendar is usually published by folk media or publishing houses.