or·bit
/ˈɔːr.bɪt/
The path followed by a celestial body in inertial space.
In astrology, the term orbit is used primarily in an astronomical context to describe the motion of planets and other celestial bodies around a central point, usually a star like the Sun or a planet like the Earth. Every planet in the solar system follows a unique orbit, which determines its position in the sky at any given time. This movement is fundamental to the construction of birth charts and the interpretation of transits and progressions. Understanding orbits allows astrology students to grasp how planetary cycles work, why retrogrades occur, and how the timing of planetary returns is calculated.
Source: Cindy McKean, NASA and Wikipedia