history - When was the term "orbit" (in the modern sense) first used and by whom?

The word orbit could refer to three latin words : orbis, which means "ring", orbitus, which describes et circular shape, and orbita, which describes the track of a wheel.

As you can see, the meanings of this word are quite old. It is therefore hard to tell the first time it was used to describe a celestial body's round trajectory. But the word itself comes from latin.