The Astronomical Clock in Prague (Czech Starom? Stský orloj) is a medieval astronomical clock located in Prague, the capital of the Czech Republic, situated in 50 ° 5'13 .23 "N 14 ° 25'15 .30" E. The clock is located in the southern wall of Old Town City Hall in Prague, being a popular tourist attraction. The three main components of the clock are: the astronomical dial, besides indicating that 24 hours a day, representing the positions of the sun and moon in the sky, and other details astronomical animated figures including "Ride of the Apostles ", a clockwork showing, when the clock strikes the hour, the figures of the Twelve Apostles. The circular calendar with medallions representing the months of the year.The astronomical dial shaped astrolabe, an instrument used in medieval astronomy and navigation to the invention of the sextant. He has painted on her representations of the earth and the sky and the surrounding elements, especially of four main components: the zodiacal ring, rotating ring, the icon representing the sun and the icon representing the Moon . The background represents the Earth and the local view of the sky. The blue circle in the center represents our planet and the darker blue the sky view from the horizon. The red and black areas indicate parts of the sky that are on the horizon. During the day the sun stands in the background blue, while the evening comes to lie in the dark. From dawn to dusk, the mechanical sun makes is always positioned on the red zone. To the left of the clock (East), we find the dawn and sunrise, while in the west we find the sunset and twilight. Astronomical Quadrant. The blue circle golden numbers represent 24 hours a day (standard format), marking Prague civil time. But we also find 12-hour division, defined by the time between sunrise and sunset and duration varies by day depending on the season....