202 1 and 2022 have different calendars. There is a time difference, but the 24 solar terms are distributed in 12 months, and each month has two solar terms. Calendars in the calendar are divided into lunar calendar, solar calendar and yin-yang calendar.

The solar calendar is also called the solar calendar, and its calendar year is the tropic of Capricorn. At present, the international Gregorian calendar and China's dry calendar belong to this category.

The lunar calendar is also called the lunar calendar, or lunar calendar. Its calendar month is a new moon, and the Gregorian calendar year is 12 new moon, with 30 days for the big moon and 29 days for the small moon. The Islamic calendar is one of the lunar calendars.

There are obvious differences between flat years and leap years in the lunar calendar, and the number of years varies greatly. Calendar month is the first month of the lunar calendar. Because there is a certain difference between 12 the first lunar month and the tropic year (about 1 1 day), leap months are set in the lunar calendar to coordinate the relationship between the tropic year and the first lunar month, and there are leap months in thirteen months of the year.