Astronomical clock
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Image:PragueTownHallClock.jpg Image:Lunddomirkeur2.jpg An astronomical clock is a clock with special mechanisms and dials to display the relative positions of the sun, moon, zodiacal constellations, and sometimes major planets.
One of the most famous of this type of clock is the Old-Town Hall clock in Prague, Czech Republic. It is also known as the Prague Orloj. The central portion was completed in 1410. The four figures are set in motion at the hour, with Death (represented by a skeleton) striking the time. On the hour there is a presentation of statues of the Apostles at the doorways above the clock, with all twelve presented at noon. In 1870 a calendar display was added below the clock.
Image:Prague - Astronomical Clock Detail 1.JPG During World War II the clock was nearly destroyed by Nazi fire. The townspeople are credited with heroic efforts in saving most of the parts. It was gradually renovated till 1948. In 1979 the clock was once more cleaned and renovated. According to local legend the city will suffer if the clock is neglected and its good operation is placed in jeopardy.
Olomouc, the former capital of Moravia in the eastern part of the Czech Republic, also has an impressive exterior astronomical clock on the main town square.
The Science Museum (London) has a scale model of the 'Cosmic Engine', which Su Sung constructed in China in 1092. This great astronomical clock was about ten meters high (about 30 feet) and was indirectly powered by falling water and mercury.
Image:Brescia astro clock.jpg The astronomical clock in Lund Cathedral in Sweden, Horologium mirabile Lundense was made at the end of the 14th century. After it had been in storage since 1837, it was restored and put back in place in 1923. When it plays, one can hear In dulci jubilo from the smallest organ in the church, while six wooden figures, representing the three magi and their servants, pass by Mary and Jesus.
The Copenhagen city hall has what is billed as a complete astronomical clock, set in an interior cabinet. The clock was designed over a period of 50 years by amateur astronomer and professional clockmaker Jens Olsen. It was assembled from 1948 to 1955. Between 1995 and 1997 the clock underwent a complete restoration.
The Palace of Versailles near Paris has a sumptuous rococo table top astronomical clock which took 12 years for a clockmaker and an engineer to build. It was presented to Louis XV in 1754.
The Gros Horloge in Rouen is a famous astronomical clock (14th century), located in the Gros Horloge street.
The Zytglogge in Bern is a famous astronomical clock from the 15. century situated in the Capital of Switzerland.
The Cathedrale Saint Jean in Lyon also has an astronomical clock from the 14th century.
More recently, independent clockmaker Christiaan van der Klaauw created a wristwatch astrolabe, the "Astrolabium 2000." Ulysse Nardin also sells several astronomical wristwatches, the "Astrolabium," "Planetarium", and the "Tellurium J. Kepler."
See also
- Antikythera mechanism
- Armillary sphere
- Astrolabe
- Orrery
- Planetarium
- Prague Orloj
- Torquetumbg:Астрономичен часовник
cs:Orloj de:Astronomische Uhr fr:Horloge astronomique sr:Астрономски сат