1911 Encyclopædia Britannica/Satellite

SATELLITE (from the Lat. satelles, an attendant), in astronomy, a small opaque body revolving around a planet, as the moon around the earth (see Planet). In the theory of cubic curves, Arthur Cayley defined the satellite of a given line to be the line joining the three points in which tangents at the intersections of the given (primary) line and curve again meet the curve.