Prague astronomical clock, also known as Prague astrological clock, is a medieval astronomical clock in Prague, Czech capital. The clock was designed according to the Earth Center theory. The clock on the top circled once a year, and the clock on the bottom circled once a day. At 12 noon every day, twelve Jesus disciples appeared by the clock, six turning left and six turning right. With the cock's crowing, the window closed and the clock rang. It is said that after the craftsman finished his work, in order to prevent him from being blinded by another stabbing, now everyone is waiting for twelve o'clock.