Jens Olsen's World Clock

[5] Displays include lunar and solar eclipses, positions of the stellar bodies, and a perpetual calendar, in addition to the time.

[1][4] The clock was designed and calculated by Jens Olsen (1872–1945), who was a skilled locksmith, and later learned the trade of clockmaking.

[8] The clock was started on 15 December 1955 by King Frederik IX and Jens Olsen's youngest grandchild Birgit.

[1][7] Deviations in expected readings identified in 1991 were caused by increased friction from oil in the pivots hardening from prolonged sun and oxygen exposure.

The clock itself is enclosed in a large glass case with wooden and stainless framing, and sits on a granite base.

The clock faces the singular entrance to the room, but visitors can view it from all sides to see the intricacy of the design.

The enclosure has internal lighting, and is temperature and humidity controlled by a ventilation plant in the basement of the building.

As it exists today the gearing and module structure is largely gold-plated brass, while the dials are rhodium plated.

In simple terms, the escapement itself acts as a remontoir such that variations in input torque are largely decoupled and do not influence the pendulum.

The Stellar Heavens movement is the top dial of the right section, and shows the current overhead celestial sphere.

Rather, most of the formulation of anomalies is handled by the Equation Works and transmitted to the Geocentric Revolution dial, where they are combined with mean motions via differentials to produce the display.

The Equation Works movement has no display on the front of the clock, and is located behind the Main Calendar in the center section.