A leap month in a leap year

Leap year: usually refers to the Gregorian calendar, that is, the leap year in AD. Four-year leap 1 day, 28 days in a normal year and 29 days in a leap year, such as 2012; Every 400 years is not a leap of 100 days, but a leap of 97 days. Three years that are not leap years are centuries that are not divisible by 400, such as 1700, 1800, 1900, 2100,2000.

Leap month, the China lunar calendar, takes the moon orbiting the earth for 29 and a half days as a monthly calendar, with 30 days in the big month and 29 days in the small month, and every 19 years. The rule of setting leap is called "neutral setting leap method", and the method of setting leap is between two winter solstices. If it is only 12 months, there is no leap. The leap month begins on the "winter solstice". When there is no "neutral spirit" in the first month, this month is a leap month, and its name is to add the word "leap" before the previous month.

Twenty-four solar terms are divided into 12 solar terms and 12 solar terms, beginning of spring solar terms, moderate rain solar terms, shock solar terms, vernal equinox solar terms, Tomb-Sweeping Day solar terms, Grain Rain solar terms, long summer solar terms, xiaoman solar terms, and so on.