You might be familiar with a leap day every 4 years on the Gregorian calendar, but did you know that the lunar calendar 음력 has a leap month? I learned this from Chulmoon:
Lunar calendar have a empty month every 4 years.
On this year has Sep..
This month is empty month in lunar calendar.
They say ‘leap month’ in English on the dictionary.
Check out Chinese Leap Year for more information.
Lunar calendar 태음력(太陰曆)
From Naver dictionary:
Both the Lunar calendar and Gregorian calendar are used in many Asian nations.
태음력과 그레고리력 둘다 많은 아시아 국가에서 사용되고 있다.