Horologium (noun)
horologium [ hawr-uh-loh-jee-uh m, hor- ]

noun, plural hor·o·lo·gi·a [hawr-uh-loh-jee-uh, hor-]
1. a building supporting or containing a timepiece, as a clock tower.
2. (initial capital letter) Astronomy. the Clock, a small southern constellation between Eridanus and Dorado

Origin: 1655–65; < Latin < Greek hōrológion, equivalent to hōrológ(os) timeteller (hōro-, combining form of hṓra hour + -log-, variant stem of légein to speak, tell + -os adj. suffix) + -ion diminutive suffix

EXAMPLES FROM THE WEB FOR HOROLOGIUM
Horologe, (Orologe), (Horologium)A general term applied indiscriminately in old writings to any mechanism for measuring time.
TIME TELLING THROUGH THE AGES|HARRY CHASE BREARLEY

In 1669 he published his important work, "Horologium Oscillatorium."
TIME TELLING THROUGH THE AGES|HARRY CHASE BREARLEY

Reticulum, the Net, is a small constellation to the east of Hydrus and Horologium.
ASTRONOMICAL CURIOSITIES|J. ELLARD GORE

Of course it will be necessary to adjust the Horologium Florae (or Flower clock) to the nature of the climate.
FLOWERS AND FLOWER-GARDENS|DAVID LESTER RICHARDSON

And that's where that horologium you were talking about came from, too.
CHRISTOPHER AND THE CLOCKMAKERS|SARA WARE BASSETT

Now YOU come up with a sentence (or fic? or graphic?) that best illustrates the word.