Prague astronomical clock

Prague astronomical clock, or Prague orloj is a medieval astronomical clock located in Prague, the capital of the Czech Republic. The clock was first installed in 1410. Making it the third-oldest astronomical clock in the world and the oldest one still operating. The oldest part of the Orloj, the mechanical clock and astronomical dial, dates back to 1410 when it was made by clockmaker Mikuláš of Kadaň and Jan Šindel.