What is "qingming"

Qīngmíng ( pīnyīn) or Chīngmíng ( MPS II), Seimei ( rōmaji), or Cheongmyeong ( romaja) is the name of the 5th solar term of the traditional East Asian lunisolar calendar, which divides a year into 24 solar terms ( 節氣/ 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.