The Planetarium Copernicus model by Ulysse Nardin combines both Ptolemy's geocentric universe with the Earth at its center and Nicolas Copernicus' heliocentric universe with the Sun at its center and makes it possible to define astronomically the exact astrological position of the planets in our solar system. As the planets circle the Sun, the wearer can also see the angles at which they face each other when viewed from the Earth. The five rings with the planets turn in relation to the Planetarium's fixed Earth. Mercury and Venus turn counter-clockwise, and Mars, Jupiter and Saturn turn clockwise. The Moon orbits the Earth in 29.53 days, which is the exact time between full moons. The outermost ring with months and the signs of the zodiac rotates clockwise and makes a complete revolution in a true year, 365 days, 5 hours, 48 minutes and 46 seconds, so no corrections are needed for leap years. This timepiece is part of Ulysse Nardin's Astronomical Trilogy, which consists of the Astrolabium Galileo Galilei (lot 325), the Planetarium Copernicus (lot 324), and the Tellurium Johannes Kepler (lot 323) models.
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Movement: The movement is ticking at the time of cataloguing and all functions are working; however, a service is recommended. Christie’s does not guarantee the future working of the movement. Case: With scratches and dents. Engraving on the bezel is missing some filling. Hallmarks on the side of the case are visible. Engravings at the back are visible. Dial: Excellent Buckle Clasp: Scratches and dents.
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