Qīngmíng, Seimei, Cheongmyeong, or Thanh minh is the name of the 5th solar term of the traditional East Asianlunisolar calendar, which divides a year into 24 solar terms (t. 節氣/s. 节气). In space partitioning, Qingming begins when the sun reaches the celestial longitude of 15° and ends when it reaches the longitude of 30°. It more often refers in particular to the day when the sun is exactly at the celestial longitude of 15°, usually on April 5.
Compared to the space partitioning theory, in the time division theory Qingming falls around April 7 or approximately 106.5 days after winter equinox. In the Gregorian calendar, it usually begins around 4 or 5 April and ends around 20 April.