Apsis: that point in the orbit of a planet or moon nearest to (lower apsis) or farthest from (higher apsis) the center of attraction; the "line of apsides" is the major (or long) axis of an elliptical orbit.
Apsis, n. (pl., apsides). The points of greatest and least distance of a heavenly body from its centre of attraction. v. Orbit.
Aquarius. The eleventh sign of the zodiac. v. Signs.
Apoapsis (Apoapse; Apapsis) The outermost point of an ellipse (as in a planetary orbit). The innermost point is called the Periapsis. ApogeeThe place in a planet's orbit which is farthest from the Earth. See Perigee.
The nearest point to the center is the peri-center, or lower apsis (the smallest-distance); the most distant point, the apocenter, or higher apsis. As indicating the particular attracting center involved, the pericenter becomes perihelion (
helio ...
Perihelion: the point in its orbit where an object is closest to the Sun (opposite of aphelion); the term perigee is used for objects orbiting the Earth; "periapsis" is used for the closest point in orbit around other bodies.
...
 See also: House, Orbit, Moon, Planet, Venus
|
