How many months are there in a year? How old are they?

There are twelve months in a year. The big month is 1 month, March, May, July, August,1October,1February, and the small month is February, April, June, September,165438+1October.

The current lunar calendar in China is a combination of yin and yang, emphasizing the length of the solar calendar and avoiding the short of the lunar calendar. According to the moon's profit and loss cycle, the "month" is determined, and the time for the earth to orbit the sun once, that is, the tropic year, is taken as the average length of a year. According to the lunar calendar, the big moon has 30 days, the small moon has 29 days, and a year has 12 months.

February is very special, with 28 days in a normal year and 29 days in a leap year.

Extended data:

The lunar calendar mainly refers to the calendar arranged according to the moon phase cycle, with the moon circling the earth as January, that is, the first month of the lunar calendar as the basis for determining the calendar month, and a year is a calendar of twelve calendar months.

The lunar calendar determines the moon on the basis of its motion law: the orbit of the moon refers to the white road, and the white road and the ecliptic road are two great circles on the celestial body, which intersect at five degrees and nine minutes. The moon goes around the earth once, and it appears on the ecliptic twice. On the 27th, it is 7 hours and 43 minutes 1 1.5 seconds, which is the time required for the moon to go around once, and it is called "sidereal moon".

Only when the moon revolves around the earth, the position of the earth also changes. The forward count is more than 27 degrees, and the moon runs 13 degrees 15 minutes every day, so it takes 12: 44: 2.8 to return to the moon on the 29th, which is called "the first moon", and it is called the moon according to customs, which means the first moon.

Lunar calendar is one of the traditional calendars in China, also known as lunar calendar, ancient calendar, Han calendar, yellow calendar, summer calendar and old calendar.

Source: China Economic Net-Lunar Year of the Pig "No Spring"? Experts dispel doubts: it has nothing to do with human luck.