Leap month refers to the month added in each leap year of the lunar calendar. The number of leap months in the lunar calendar is 29 or 30 days, just like normal months. The establishment of leap year is to make up for the time difference between the number of days in a year and the actual period of revolution of the earth caused by man-made calendar regulations. The year to make up for the time difference is leap year. Leap years include years with leap days in Gregorian calendar or summer calendar. A leap year has 366 days.
Leap month is an added month and date in the lunar calendar, which makes the average length of the calendar year close to the tropic year. In the lunar calendar, the length of the first lunar month (29.5306 days) is taken as the average value of one month, and the whole year is 12 months, which is about 10 days and 2 1 hour different from the tropical year (365.2422 days), so it is necessary to set a leap. In ancient times, three years and one month and five years and two months were used as leap.
For example, the birthday celebrated on July 1 day is on July 1 day. On the other hand, if you were born on New Year's Eve, if there is no 30 this year, you will celebrate your birthday on the 29th of New Year's Eve. Born in Pingyue, I will celebrate my birthday in Pingyue every year; Born in a leap month, if it happens, it will be in a leap month, if it doesn't happen, it will be in a flat month; Those born in 30 years will be over 29 years old if they miscarry.