Lunar calendar 12. 13 belongs to the lunar calendar.

Lunar calendar 65438+ February 13 is lunar calendar 65438+ February 13.

Lunar calendar (lunar calendar): The lunar calendar in China does not belong to this category, but people are used to calling it the lunar calendar in their lives. Take the waning period of the moon (that is, the new moon, equal to 29.530588 days) as one month, and the product of 12 months is one year. It completely ignores the annual apparent motion law of the sun, so the date of the lunar calendar can't show the warmth and coldness of the four seasons. This calendar has no practical value, except for Islam, it has been abandoned. The lunar calendar is also called lunar calendar, ancient calendar, Han calendar, yellow calendar, summer calendar and old calendar.

Yin-Yang calendar: It is a combination of Yin and Yang, commonly known as "lunar calendar". The lunar calendar in China belongs to this category, with the cycle of the moon phase as the month length and the year of the return of the sun as the age. By setting leap months, the average calendar year is adapted to the tropical year. According to the date of the lunar calendar, we can not only know the ebb and flow of tides, but also grasp the changes of seasons.