Jens Olsen's World Clock, Mechanical astronomical clock in Copenhagen City Hall, Denmark.
The clock contains 15,448 mechanical parts displaying global times, dates, planetary positions, solar time, and astronomical calculations with extreme precision.
King Frederik IX and Jens Olsen's granddaughter Birgit initiated the clock's operation on December 15, 1955, after twelve years of construction.
The clock mechanisms include brass parts made from kitchen utensils donated by Danish households during the 1940s to support its construction.
Visitors can examine the clock at Copenhagen City Hall from Monday through Friday between 9 AM and 4 PM, and Saturdays from 9:30 AM to 12:45 PM.
The slowest gear in the clock takes 25,753 years to complete one full rotation, making it the most gradual mechanical movement worldwide.
Location: Copenhagen Municipality
Creator: Jens Olsen
GPS coordinates: 55.67556,12.56944
Latest update: May 10, 2025 20:51
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