How is leap month determined?

Year: It is a year from midnight in winter to midnight in winter.

Winter Moon (165438+ October): The month of winter solstice is 165438+ October.

Zhong Qi: Among the 24 solar terms, rain, vernal equinox, Grain Rain, Xiaoman, Summer Solstice, Summer Solstice, Autumn Equinox, First Frost, Light Snow, Winter Solstice and Great Cold are Zhong Qi, which is calculated according to the ecliptic.

Month: A lunar cycle is one month, about 29.5 days. A month begins at midnight of the new moon and ends before the next midnight of the new moon. The size of a month is determined by the phase of the moon.

New moon, winter solstice, solar terms and neutral atmosphere are all accurate to minutes, and the dates in minutes are new moon and winter solstice.

How to determine whether there is a leap month;

If there are 12 full months and 2 incomplete months between two winter solstice days, then a leap year will be set in that year.