Striking clock
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A striking clock is a clock that sounds the hours audibly on a bell, gong, or other audible device. In 12-hour striking, used most commonly in striking clocks today, the clock strikes once at 1:00 am,
The Elizabeth Tower of the Palace of Westminster in London, commonly referred to as Big Ben, is a famous striking clock.
Armillary sphere
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An armillary sphere is a model of objects in the sky, consisting of a spherical framework of rings, centered on Earth or the Sun, that represent lines of celestial longitude and latitude and other ast
Jost Bürgi and Antonius Eisenhoit: Armillary sphere with astronomical clock, made in 1585 in Kassel, now at Nordiska Museet in Stockholm
Chinese Armillary sphere at Beijing Capital International Airport Ziwei Chenheng Aug-2010
The original diagram of Chinese scientist Su Song's book of 1092 showing the inner workings of his clocktower; a mechanically rotated armillary sphere crowns the top.
Armillary sphere at Beijing Ancient Observatory, replica of an original from the Ming dynasty