A Latin word meaning 'sky' or 'heaven,' also the name of a faint constellation in the southern hemisphere.
From Latin caelum, related to the Proto-Indo-European root meaning to carve or hollow out, conceptually the 'hollow dome' of the sky. The constellation was named in the 18th century.
The Romans used 'caelum' to mean both the physical sky and the divine heavens—no separation between astronomy and theology! Today it's one of the faintest constellations, easy to miss with the naked eye.
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