Bai-lu (noun) 白露 (Chinese): White Dew (15th solar term), literally in Chinese “bai” 白 = white, “lu” 露 = dew.

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Bai-lu is the 15th solar term of 24 solar terms on traditional East Asian calendars.  Bai-lu begins when the Sun reaches the celestial longitude of 165° and ends when it reaches the longitude of 180°. Bai-lu often refers in particular to the day when the Sun is exactly at the celestial longitude of 165°. In the Gregorian calendar, Bai-lu usually begins around September 7 and ends around September 23. Mid-Autumn Festival (Moon festival) is celebrated around Bai-lu.

In ancient China, Bai-lu was divided into three periods of 15 days: “In the first period 鸿雁来, the migrating geese start to fly south to avoid the cold; In the second five days 玄鸟归, mystery swallows return; during the third period 群鸟养羞, all birds begin to store their dried fruits and grain foods for the winter.

Bai-lu can be seen as a symbol of the beginning of the cold weather. The grasses and plants are covered with white dew in Bai-lu because of the cold climate at night and dawn. There is a Chinese proverb: “Your body shouldn’t be exposed too much after bai-lu”. This proverb reminds everyone to wear more clothes after Bai-lu. It is easy to get cold and to induce old diseases. People who are weak, have stomach problems or chronic lung diseases, need to keep warm in the morning and evening.

Since ancient times, Bai-lu has been a solar term for agricultural purposes in the lunar calendar. Bai-lu is still remembered and celebrated as a Chinese traditional festival.