High point of an orbit.
The farthest point on an orbit from the primary body. For earth orbits, apoapsis is called apogee.
That point in an orbit farthest from the center of attraction.
The point in an orbit when the two objects are farthest apart. The opposite of periapsis.
The point in an orbit when a planet is farthest from any body other than the Sun or the Earth.
The outermost point of an ellipse (as in a planetary orbit). The innermost point is called the Periaspsis.
The point in orbit farthest from the planet.
The farthest point in an orbit from the body being orbited. (Related terms include aphelion, apogee, and apocrone, which are apoapses in Sun, Earth, and Saturn orbits, respectively.) See also periapsis.
That point in an orbit which is farthest from the primary.