The Prague astronomical clock, mounted on the southern wall of Old Town Hall in the Old Town Square, was first installed in 1410, making it the third-oldest astronomical clock in the world and the oldest one still operating. Its oldest part, the mechanical clock and astronomical dial, was made by clockmaker Mikuláš of Kadaň and Jan Šindel, then later a professor of mathematics and astronomy at Charles University. Later, presumably around 1490, the calendar dial was added and the clock facade was decorated with gothic sculptures.
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