Liqiu

Source: JPL Horizons On-Line Ephemeris System

The traditional East Asian calendars divide a year into 24 solar terms (節氣). Lìqiū (pīnyīn), Risshū (rōmaji), or Ipchu (romaja) (Chinese and Japanese: 立秋;Korean: 입추(S)/립추(N);Vietnamese:Lập thu;literally: "start of autumn") 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°. In the Gregorian calendar, it usually begins around August 7 and ends around August 23.