3 More Creations Meant to Last Forever
Constructed over a dozen years, Danish watchmaker Jens Olsen's masterpiece is designed to work for more than 25,000. (So far it has been ticking away in Copenhagen's City Hall for 57 years.)
Besides local, world, and solar times, the entirely mechanical clock tabulates (among other things) a 2500-year Gregorian calendar, the epact of the moon, solar and lunar cycles, the procession of the night sky, and the lunar and planetary orbits. The clock has 15,448 individual parts, more than 14,000 of them gears. And the slowest of these, which tracks the precession of Earth's axis, will complete a revolution every 25,753 years. A complete overhaul in the 1990s ensured that the machine will get at l east a respectable fraction of the way to its 25,000-year goal.
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