How to calculate the lunar leap year? Is it the same as the national calendar?

In the lunar leap year, there is a leap month every three years. Based on this calculation, there are five leap months every 19 years.

Every three years plus one month is the leap month of the lunar calendar. A year with a leap month is also called a leap year, so there is a folk saying that three years are two leaps and three years are not leap.

The traditional lunar calendar adopted by China for thousands of years is a combination of yin and yang, which not only considers the Gregorian tropic year directly related to the sun, but also considers the lunar calendar that changes with the moon.

A lunar month is about 29.5 days, and the lunar calendar generally takes 12 lunar months as a year, totaling 354 days or 355 days, which is about 1 1 day less than the return year of the solar calendar.

In order to coordinate the lunar year and the solar year, the ancients arranged "19 seven leap years", that is, a leap month was arranged in the middle of the lunar year every two or three years. So there is a leap year and a peace year.

Different from the fixed solar year of 365 days or 366 days, the leap year of the lunar calendar has about 384 days because there is an extra leap month, while the average year of the lunar calendar generally has 354 days or 355 days.

Extended data:

The birth of the new moon

The first month of the lunar calendar is the average period of the moon's revolution around the earth relative to the sun. Is the average cycle of monthly profit and loss. The average time interval from the new moon to the next new moon or from hope to the next hope is 29.53059 days.

With the change of the relative positions of the sun, the moon and the earth, the moon presents different shapes on different dates, which is the periodic change of the moon phase.

Because the moon keeps rotating around the earth and changes its position from time to time, the hemisphere facing the earth and the hemisphere irradiated by the sun sometimes coincide completely, and sometimes they don't, so the moon shows cloudy and sunny changes.

Our ancestors called the period when the moon was full and short "Wang Shuoyue" and the day when the moon could not be seen at all "Shuori" as the first day of each month in the lunar calendar. Call the day when the moon is the roundest "looking at the sun" and the fifteenth (or sixteenth) month of the lunar calendar.

From the new moon to the moon, it is the first half of the moon; From looking at the new moon, it is the second half of the new moon; From the new moon to the hope and then to the new moon is a month of the lunar calendar. A lunar month is 29 days and a half, actually it is 29 days 12 hours, 44 minutes and 3 seconds.

Phoenix. Astronomers explained why the Lunar New Year is divided into flat years and leap years.

Baidu encyclopedia-leap year

Baidu Encyclopedia-Shuowangyue