Qingming/Origin

Origin
Qīngmíng or Chīngmíng or Seimei is the name of the 5th solar term of the traditional East Asian lunisolar calendar, which divides a year into 24 solar terms. 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°. In the Gregorian calendar, it usually begins around 4 April or 5 April and ends around 20 April.