Apogee
It's called an APHELION
The point in the orbit of the moon or of an artificial satellite that is most distant from the center of the earth is called the 'apogee'.
An apareon is the point in an orbit around Mars which is most distant from the planet.
That would be its Apogee.
Focus or the focal point.
An apoherm is the point most distant from Mercury of an object in orbit around Mercury.
An apocynthion is the point in an object's orbit around a moon which is most distant from the body.
This is the Perihelion. The aphelion is when it is at it's most distant point.
the most distant
The duration of The Most Distant Course is 1.97 hours.
That kind of person is most often called a missionary.