Horologium

Meanings

1. Synonym of Tower of the Winds, a monument in ancient Athens that included a clepsydra and multiple prominent sundials.
2. Synonym of Solarium, a monument in ancient Rome whose obelisk was once believed to have acted as a sundial gnomon.
3. A constellation of the southern sky, said to resemble a pendulum clock. It lies between the constellations Fornax and Dorado.
4. Alternative letter-case form of horologium, the book of hours in the Eastern Orthodox and Catholic churches.

1. Synonym of chronometer or clock, a timekeeping device.
2. Synonym of astronomical clock.
3. Synonym of horologion, the book of hours in Eastern Orthodoxy and Catholicism.

Etymology

See horologium. As a location in Rome, a clipping of Latin Hōrologium Augustī (“Sundial of Augustus”). As a constellation, a clipping of Latin Hōrologium Oscillitorium (“Pendulum Clock”), coined in 1763 by the French astronomer De Lacaille to honor the Dutch astronomer and mathematician Christian Huygens, who had written a major work by that name.