The term 'Orbit Parts' can refer to the different components of an orbit. The four-letter solution ARCS is an acronym for 'Apogee, Perigee, and Satellites'. Apogee is the point in an orbit when the satellite is furthest from the Earth, while Perigee is the point when it is closest. Satellites are objects that orbit around a larger object, such as a planet. Together, these three components make up the parts of an orbit.