개천절
National Foundation Day
Celebrates the legendary founding of Gojoseon, Korea's first kingdom, by Dangun.
DoCeremonies are held, including one at Chamseongdan altar on Ganghwa Island, said to have been built by Dangun.
Examples
오늘은 하늘이 열린 날, 개천절이에요.
oneureun haneuri yeollin nal, gaecheonjeorieyo.
Today is Gaecheonjeol — “the day the sky opened.”