What does it mean to have five trees on the moon?

"There are five watches on the treetops of the moon", which means that the moon climbed the treetops of willow trees and reached five watches. The ancients didn't have clocks, so they used the moon and the sun to judge time. It even refers to 3-5 am, which is Yin Shi.

Limited by the level of science and technology and the means of timing, in ancient China, the night was divided into five periods, and the time was drums, which were called five watches, five drums, or five nights. Historical books and a large number of literary works are recorded, such as:

1, "Peacock Flying Southeast": "Raise your head and sing to each other until you reach the fifth watch every night."

2. "Heroes Will Recruit Jiang Gan": "When you are listening to it, snare drum is two more."

3. "Climbing Mount Tai": "Wu Shenhui, five drums, sitting in the pavilion with Ziying."

4. Book with Wife: "Xin Wei read six nights and four drums in March, which means calligraphy."