Apsis

Part of speech: noun (n.)

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.

2. In a curve referred to polar coördinates, any point for which the radius vector is a maximum or minimum.

3. Same as Apse.