Leap Year and Leap Month Search

1. A leap year and a leap month are two distinct concepts, belonging to the calculation methods of the solar calendar (Gregorian calendar) and the lunar calendar (agricultural calendar), respectively.

2. A leap year is a special year in the Gregorian calendar designed to align the calendar year with the astronomical year. In a leap year, February has 29 days, whereas in a common year, February has only 28 days.

3. A leap month is a special month in the Chinese lunar calendar, established to adjust the time difference between the lunar year and the solar year. The lunar calendar is a lunisolar calendar, meaning it combines the phases of the moon with the position of the sun.

4. A lunar year typically consists of 12 months, but in certain years, an extra month—known as a leap month—is inserted, resulting in a year with 13 months.