How to calculate leap month

Leap moon refers to a phenomenon in the lunar calendar. The lunar calendar arranges the big moon and the small moon, that is, the moon, according to the full and short moon. The length of a moon is 29.5306 days, which is the cycle of the moon's profit and loss. According to the lunar calendar, there are 30 days for the big moon and 29 days for the small moon, and a year is 12 months * * 354 days. The lunar month has no seasonal significance, so just after 17, the date of the lunar calendar will be reversed with the seasons. For example, one year's New Year is spent in the snow, and after 17, the vermicelli will be shaken to celebrate the New Year.

The use of such a calendar naturally cannot meet the needs of agricultural production, so the lunar calendar in China has been in parallel with the 24 solar terms since the Qin and Han Dynasties, and the 24 solar terms are used to guide agricultural production. ?

Leap moon-the leap moon in the lunar calendar

[ rùn yuè ]？

Basic explanation

detailed description

The difference between the lunar year and the tropic year is about 10 and 2 1 day, so we should make a leap, that is, three years and one month, five years and two months, and nineteen years and seven months. Every month added in leap year is called leap month. Originally placed at the end of the year, it was called "March" or "leap month"; Adding a month later is called "leap month".

"Book Essentials": "Well, there are six days in three hundred and sixty years, and the age is set at four o'clock in the leap month." ?

Make a sentence

1. Determines whether the specified month in the specified era year is a leap month.

2. Third, the balance mode of leap month includes a pause and pause correction and intervention.

3. Judge whether the specified month in the specified year of the current era is a leap month.

4. Calculate the leap month of the specified year or year and era.

The leap month in the early Han dynasty was placed after September, which was called "post-September".