The traditional Chinese calendar divides a year into 24 solar terms.

[1] Lìqiū, Risshū, Ipchu, or Lập thu (Chinese: 立秋; pinyin: lìqiū) is the 13th solar term.

It begins when the Sun reaches the celestial longitude of 135° and ends when it reaches the longitude of 150°.

It more often refers in particular to the day when the Sun is exactly at the celestial longitude of 135°.

Liqiu signifies the beginning of autumn in East Asian cultures.