Apoapsis

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Definition

The point at which a general orbit is farthest from the center of mass is known as its apofocus. The distance between the apofocus and the center of mass is known as the apofocus distance or apoapsis.

The point at which a general orbit is closest to the center of mass is known as perifocus. Celestial bodies have specific terms relating to the apsides of their orbits. Of particular importance is the fact that apogee is measured differently from the others.

See also