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apsis

The apex of the elliptical orbit of a satellite

is called the apex, the closest point to the Earth is called the perigee or periapsis, and the farthest point to the Earth is called the apogee or apoapsis. If one connects the periapsis with the apoapsis by the center of the earth, then one speaks of the apsidal line.

Apsides, the vertices of satellite orbits

Apsides, the vertices of satellite orbits

The elliptical satellite orbits are clearly marked by the perigee and apogee.

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Englisch: apsis
Updated at: 31.05.2009
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