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Meaning Of 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.
n.
In a curve referred to polar coordinates, any point for
which the radius vector is a maximum or minimum.