https://en.wikipedia.org/wiki/Qingming_(solar_term)
Qīngmíng, Seimei, Cheongmyeong or Thanh minh, is the name of the 5th solar term of the traditional Chinese lunisolar 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 …