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De Dondi's clock was a seven-faced construction with 107 moving parts, showing the positions of the sun, moon, and five planets, as well as religious feast days. [10] Both these clocks, and others like them, were probably less accurate than their designers would have wished.
The majority of the clocks involved are caesium clocks; the International System of Units (SI) definition of the second is based on caesium. [6] The clocks are compared using GPS signals and two-way satellite time and frequency transfer. [7] Due to the signal averaging TAI is an order of magnitude more stable than its best constituent clock.
The Orloj is mounted on the southern wall of Old Town Hall in the Old Town Square.The clock mechanism has three main components – the astronomical dial, representing the position of the Sun and Moon in the sky and displaying various astronomical details; statues of various Catholic saints stand on either side of the clock; "The Walk of the Apostles", an hourly show of moving Apostle figures ...
The clock was designed and calculated by Jens Olsen (1872–1945), who was a skilled locksmith, and later learned the trade of clockmaking. He also took part in the beginning of the clock's construction, and died in 1945, 10 years before the clock was completed. [3] The clock consists of 12 movements which together have 15,448 parts.
The first astronomical clock in the cathedral existed from 1408 until it was destroyed in 1534 as part of the iconoclasm during the Baptist rule.No drawing has been handed down to show us what that clock looked like, but, like other ornamental clocks of the 14th and 15th century, it will doubtless have consisted of three parts: the procession of the Three Magi, the clock face, and the calendar ...
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The astronomical clock of Messina is an astronomical clock constructed by the Ungerer Company of Strasbourg in 1933. It is built into the campanile of Messina Cathedral. The mechanism was designed by Frédéric Klinghammer, with the artistic design based on plans by Théodore Ungerer. Parts of the design are similar to the Strasbourg ...
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