A clock with multiple dials, which indicates the time in various parts of the world, all the dials being driven in synchronisation from one master-clock movement. The universal clock is also known as a world-time clock, and many were made for the offices of commercial firms, steamship ompanies, etc. , in the 19th century. An outstanding example by Christian Gebhard, begun in 1865 in Marseilles and finished in Germany in 1895, may be seen at the time Museum, Rockford, Illinois. Since this clock, however, also incorporates mean time, solar time, sidereal time, decimal time, a 24-hour revolving globe, a star and constellation indicator, planetary indicator, perpetual calendar, lunar cycle, Dominical letter indicator, sunrise and sunset indicator, automata figures, a crowing cock and numerous other indications, as well as showing the time in nine of the world's principal cities, it is known as an astronomical and world-time clock.