Jens Olsen's World Clock, Copenhagen, Denmark

Jens Olsen's World Clock is an astronomical clock located in Copenhagen City Hall. The clock was designed and calculated by Jens Olsen. The clock has 12 movements which together have over 14,000 parts. It must be wound once a week. The dials display time, lunar and solar eclipses, positions of the stellar bodies, and a perpetual calendar. The fastest gear completes a revolution every ten seconds and the slowest every 25,753 years.
The calculations for the clock were made up until 1928 and the actual production of the clock took place from 1943 until 1955. The clock was started on 15 December 1955 by King Frederick IX and Jens Olsen's youngest grandchild Birgit.

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