Breath and Relax. Let's consider the noble qualities of the constellation Monoceros. Monoceros is a faint constellation on the celestial equator. Its name means unicorn in Greek. Its definition is attributed to the 17th-century Dutch cartographer Petrus Plancius. It is bordered by Orion to the west, Gemini to the north, Canis Major to the south, and by Hydra to the east.