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An astronomical instrument is a device for observing, measuring or recording astronomical data. They are used in the scientific field of astronomy, a natural science that studies celestial objects and the phenomena that occur in the cosmos, with the object of explaining their origin and evolution over time. Many are also used in navigation and ...
The astronomical clock in the tower of the New Town Hall was installed in 1910. Kryštofovo Údolí. The Kryštofovo Údolí astronomical clock is a modern astronomical clock (inaugurated in 2008), built-in a former electrical substation. Hojsova Stráž. An astronomical clock in the Bohemian Forest was inaugurated in 2017. It has a concentric ...
The clock was originally installed in a former electrical substation in Kryštofovo Údolí. The project started in 2006, it was inaugurated on 20 September 2008, and completed in 2011. In 2023, the owner of the clock (Martin Chaloupka's daughter Alice Chmelíková) decided to move the clock to the former fire station in Žibřidice. [2]
Jens Olsen's World Clock or Verdensur is an advanced astronomical clock which is displayed in Copenhagen City Hall. [ 1 ] [ 2 ] The clock consists of 12 movements which together have 15,448 parts. [ 3 ] [ 4 ] The clock is mechanical and must be wound once a week. [ 5 ]
The 4-minute difference between the solar day and sidereal day requires a correction of this giant clock based on the date of observation, and nocturnal helps to apply this correction. [ 1 ] Sometimes called a horologium nocturnum (time instrument for night) or nocturlabe (in French and occasionally used by English writers), it is related to ...
The Riefler escapement is a mechanical escapement for precision pendulum clocks invented and patented [1] by German instrument maker Sigmund Riefler in 1889. [2] It was used in the astronomical regulator clocks made by his German firm Clemens Riefler from 1890 to 1965, [3] which were perhaps the most accurate all-mechanical pendulum clocks made.