Jens Olsen’s World Clock
This Copenhagen, Denmark clock displays not only the time, but also lunar and solar eclipses, positions of stellar bodies and a perpetual calendar. The clock – which has 12 movements and 15,448 parts – was designed and calculated by Jens Olsen, who died a decade before its completion. Its inception began in 1934, but the clock’s construction ended in 1955.
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Source: Reader’s Digest magazine