How to calculate the lunar birthday?

The calculation of the lunar calendar has the following four rules:

1. The calculation of the occurrence time of all new moons and solar terms is based on the east longitude 120 degrees, that is, the standard time of the East Eighth District. However, when calculating the lunar calendar time before 1929, Beijing local time, that is, east longitude 1 16 degrees 25, shall prevail.

The day when the new moon appears is the first day of a month. If a solar term appears on this day, whether it appears later than the new moon or not, it will be counted as falling into the new moon.

The annual winter solstice is always in 1 1 month this year. The period from the second day of the winter solstice to the next winter solstice is called one year old. If there are thirteen new moons in a year, then this year is a leap year, plus leap months.

The first month of leap year without gas is leap month. Because there is only twelve breaths in a year, there may be no breath for at least one month or two months in a leap year. But in this case, only the first month without breath is a leap month. When the month before leap month is a month, it is called leap month.