Proper noun
Horologium
(astronomy) A constellation of the southern sky, said to resemble a pendulum clock. It lies between the constellations Fornax and Dorado.
Berlin, 1801, p.17 Characteristics Caelum is bordered by Dorado and Pictor to the south, Horologium and Eridanus to the east, Lepus to the north, and Columba to the west. Source: Internet