That orbital point of a noncircular orbit farthest from the center of attraction. Opposite is PERIGEE

That orbital point of a noncircular orbit farthest from the center of attraction. Opposite is PERIGEE

Related Terms 
LINE OF APSIDES
The line connecting the two points of an orbit that are nearest and farthest from the center of attraction, such as the perigee and apogee of the moon or the perihelion and aphelion of a planet. Also called APSE LINE.

APSIS
Either of the two orbital points nearest or farthest from the center of attraction, the perihelion and aphelion in the case of an orbit about the sun, and the perigee and apogee in the case of an orbit about the earth. The line connecting these two points is called LINE OF APSIDES.

ALTITUDE OF THE APOGEE
As defined by the International Telecommunica tion Union (ITU), the altitude of the apogee above a specified reference surface serving to represent the surface of the earth.

APOGEAN TIDES
Tides of decreased range occurring monthly as the result of the moon being at apogee (farthest from the earth).

APOGEAN TIDAL CURRENTS
Tidal currents of decreased speed occurring monthly as the result of the moon being at apogee (farthest from the earth).

PARALLAX INEQUALITY
The variation in the range of tide or in the speed of a tidal current due to changes in the distance of the moon from the earth. The range of tide and speed of the current tend alternately to increase and decrease as the moon approaches its perigee and apogee, respectively, the complete cycle being the anomalistic month. There is a similar but relatively unimportant inequality due to the sun; this cycle is the anomalistic year. The parallax has little direct effect upon the lunitidal intervals but tends to modify the phase effect. When the moon is in perigee, the priming and lagging of the tide due to the phase is diminished and when in apogee the priming and lagging is increased.

NUTATING ANTENNA
An antenna system used in conical scan radar, in which a dipole or feed horn moves in a small circular orbit about the axis of a paraboloidal reflector without changing its polarization.

INCLINATION OF AN ORBIT
1. See INCLINATION, definition 2. 2. As defined by the International Telecommunication Union (ITU), the angle determined by the plane containing an orbit and the plane of th

INTERMEDIATE ORBIT
A central force orbit that is tangent to the real (or disturbed) orbit at some point. A fictitious satellite traveling in the intermediate orbit would have the same position, but not the same velocity, as the real satellite at the point of tangency

LINE OF NODES
The straight line connecting the two points of intersection of the orbit of a planet, planetoid, or comet and the ecliptic; or the line of intersection of the planes of the orbits of a satellite and the equator of its primary.

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