The first full moon of the new lunar year, a day known as Daeboreum, will not be visible in Korea.
The Korea Astronomy and Space Science Institute said the moon will rise at 5:40 p.m. in Seoul on Friday and set at 7:04 a.m. on Saturday, but it will not be completely full until well after sunrise at 8:53 a.m. on Saturday and thus invisible with the naked eye.
The reason is the difference in duration between calendar months and the cycle of the moon. In lunar calendars, months are 29 or 30 days long, but the moon's phase cycle repeats on average every 29.53 days.
This year's largest visible full moon comes on Aug. 11.