The Hall of Prayer for Good Harvest is a big palace with round roof and three layers of eaves. Inside the Hall are 28 huge posts. The four posts along the inner circle represent four seasons-spring, summer, autumn and winter; the 12 posts along the middle circle represent the 12 months; and 12 posts along the outer circle represent 12 Shichen (Shichen is a means of counting time in ancient China. One Shichen in the past equaled two hours and a whole day was divided into 12 Shichens).
