In the heart of Prague's Old Town, the ancient astronomical clock, known as Orloj, marks the passage of time with its complex mechanism and enigmatic characters. A marvel of medieval technology that has survived the centuries to the present day. In this game, you play as a master builder who attempts to leave his mark on history by adding the legendary and majestic calendar to ancient Orloj. Precision, balance and knowledge of the cosmos will be the keys to carrying out this complex task. Every gear, every sphere, and every zodiac sign you assemble brings you one step closer to completing this masterpiece that will mark time in the city for generations. Each turn, players place workers on the clock face in order to obtain resources and perform actions with the goal of building the Orloj calendar. In addition to hiring helpers, players will build the Apostles' Chime and expand their knowledge in three areas where experience will improve their abilities. The game ends when the schedule is complete. The player with the highest number of harmony points wins the game.