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Directly above the 24-hour dial is the dial of the Primum Mobile, so called because it reproduces the diurnal motion of the stars and the annual motion of the sun against the background of stars. It is basically an astrolabe drawn using a south polar projection, with a fixed tablet and a rete of special design that rotated once in a sidereal day.
A moon dial circles the inner ring of the zodiac, displaying the moon phase. The principal hand of the clock indicates the time of day on the outer ring of 24 golden Roman numerals, which run twice from I to XII. It features two suns, the smaller one indicating the date on the rete's calendar dial. The larger one circles the zodiac at one ...
A second type of clock face is the 24-hour analog dial, widely used in military and other organizations that use 24-hour time. This is similar to the 12-hour dial above, except it has hours numbered 1–24 (or 0–23) around the outside, and the hour hand makes only one revolution per day.
The Ploërmel astronomical clock, constructed 1850–1855, comprises an astronomical clock with 10 dials and an orrery. Rouen. The Gros Horloge has a movement built in 1389, with a dial added in 1529. It indicates the moon phase on a rotating sphere above the dial, and the day of the week in an aperture at the base of the dial. Saint-Omer.
Giovanni Dondi dall'Orologio (c. 1330 – 1388), also known as Giovanni de' Dondi, was an Italian physician, astronomer and mechanical engineer in Padua, now in Italy.. He is remembered today as a pioneer in the art of clock design and construction.
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The interior dial of the clock proposes a model of the universe (above right). Against a background of stars, the Sun (the large gilded star on the outer ring) moves in a circle, and indicates the time using the 24-hour analogue dial, which is marked in Roman numerals from I to XII, then from I to XII again. Noon is at the top of the dial ...
The 16th-century church clock at Arnemuiden indicates the time of local high tide as a pointer on a 12-hour clockface. Maassluis. Jacob Venker's tide clock on the exterior of the Nationaal Sleepvaart Museum was installed in 1996. Despite the clock's traditional dial, it is computer-controlled, and accounts for 94 waves in its tidal timekeeping.