What is "bailu"

The traditional East Asian calendars divide a year into 24 solar terms (節氣). Báilù ( pīnyīn), Hakuro ( rōmaji), or Baengno ( romaja) is the 15th solar term. It begins when the Sun reaches the celestial longitude of 165° and ends when it reaches the longitude of 180°. It more often refers in particular to the day when the Sun is exactly at the celestial longitude of 165°. In the Gregorian calendar, it usually begins around September 7 and ends around September 23. Mid-Autumn Festival is celebrated around this time.