What does Hong Jun's seven-star chart stand for?

Hong Jun's ancestor's seven-star disk represents the Big Dipper and has a specific meaning. The bucket handle of the Big Dipper points in different directions in different seasons. Spring represents the East, summer represents the South, autumn represents the West and winter represents the North. At the same time, according to the direction of bucket handle and the Big Dipper, we can determine the 24 solar terms, and then guide agricultural activities. At this level, Hong Jun's ancestor's seven-star disk can be regarded as an ancient astronomical observation tool, which has the function of guiding farming.