Wooden Calendar

The wooden calendar is a tool invented by the ancient Hezhe people to record years or major events. For thousands of years, the wooden calendar has played an important role in the traditional production and life of the Hezhe people, and it is also a great contribution to the cultural treasure house of the Chinese nation.
The original wooden calendar was very simple. The entire wooden calendar consists of a rope and 30 small wooden strips. Each wooden strip has the same length, width and thickness. A hole is chiseled in the middle of the wooden strip, which is strung with a rope and hung on the wall. When they need to calculate time, they first push all the wooden strips to one side of the rope, and move one wooden strip to the other side every day. After moving 30 wooden strips, it means that a month has passed.
The wooden calendar is in the shape of a disc, symbolizing the full moon in the clear night sky. The disc is divided into two columns, the upper column hangs 12 round wooden blocks, representing 12 months; the lower column hangs three kinds of wooden strips of different lengths. Among the following wooden strips, the shortest represents the day, the long wooden strip represents the beginning of the ten-day period, and the longest wooden strip is the "boundary strip", which is located in the middle of the following. The left side of the boundary bar represents the time that has passed in a year, and the right side represents the days to come. A short stick represents a day, a long stick represents a decade, 10 days represent a decade, and 3 decades represent a month.