1. The point in an orbit farthest from the body being orbited.
Usage: technical; astronomy

Examples

• The satellite reaches its apoapsis once per orbit.
• At apoapsis, the spacecraft moves more slowly than at any other point in its elliptical path.
• Engineers calculated the apoapsis altitude to be 22,000 miles above Earth.
• The Moon's apoapsis is about 252,000 miles from Earth.
• Apoapsis is the opposite of periapsis in orbital mechanics.