The Astronomical Clock was installed on the southern wall of the Old Town Hall in Prague in 1410. The clock was the work of clockmaker Mikuláš of Kadaň and Jan Šindel, a professor of mathematics and astronomy at Charles University. One of the most famous features of the Astronomical Clock is “The Walk of the Apostles.” Every hour, a small trap door opens, and figures of the twelve apostles move in and out of the clock.
The clock features an astronomical dial that represents the position of the sun and moon in the sky, as well as various other astronomical details. It includes zodiacal circles, a rotating sun, and a moon with its phases. Below the astronomical dial, there is a calendar dial with medallions representing the months. The outer circle of the dial shows the signs of the zodiac.
The Clock is not only a remarkable timekeeping device but also a symbol of medieval craftsmanship and astronomical knowledge. Its intricate design and the hourly show captivates tourists and visitors from around the world, who gather in the Old Town Square to witness the hourly show. It’s a must-see attraction in the heart of Prague.