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Apsis :: Apsis (n.) One of the two points of an orbit, as of a planet or satellite, which are at the greatest and least distance from the central body, corresponding to the aphelion and perihelion of a planet, or to the apogee and perigee of the moon. The more distant is called the higher apsis; the other, the lower apsis; and the line joining them, the line of apsides..

Apsis :: Apsis (n.) Same as Apse.

Apsis :: Apsis (n.) In a curve referred to polar coordinates, any point for which the radius vector is a maximum or minimum..

Apsides :: Apsides (n. pl.) See Apsis.

Regrede :: Regrede (v. i.) To go back; to retrograde, as the apsis of a planet's orbit..

Absis :: Absis (n.) See Apsis.

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