01 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, corresp…
pl.
Apsides ((ăp"sĭ*dēz))
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1.
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.(Astron.)
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2.
In a curve referred to polar coördinates, any point for which the radius vector is a maximum or minimum.(Math.)
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