| The orbit has to have some inclination to it for the apoapsis to get into the magnetotail. |
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| The point nearest the focus is the pericentre, or periapsis, and that farthest from it is the apocentre, or apoapsis. |
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| The line of apsides is a line which passes through both periapsis, Cassini's closest approach to Saturn in an orbit, and apoapsis, the farthest spot in the orbit from Saturn. |
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| Both passes are inclined to the ring plane so that they are in the northern hemisphere near periapsis, or perikron, and in the southern hemisphere at apoapsis, or apokron. |
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