Apsis

Definition of Apsis

Ap´sis   Pronunciation: ăp´sĭs
n.1.(Astron.) 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.
2.(Math.) In a curve referred to polar coördinates, any point for which the radius vector is a maximum or minimum.
3.(Arch.) Same as Apse.

Related Words

apse, church, church building, niche, recess, tribune
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