# PERSPECTIVE PROJECTION

The representation of a figure on a surface, either plane or curved, by means of projecting lines emanating from a single point, which may be infinity. Also called GEOMETRIC PROJECTION.

## Related Terms

### SPREAD

The divergence of the air stream in a horizontal or vertical plane after it leaves the outlet.

### HORIZONTALLY POLARIZED WAVE

A plane polarized electromagnetic wave in which the electric field vector is in a horizontal plane.

### HEXAGON

A closed plane figure having six sides

### HORIZONTAL

Parallel to the plane of the horizon; perpendicular to the direction of gravity

### 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

### INCLINATION

1. The angle which a line or surface makes with the verti- cal, horizontal, or with another line or surface. 2. One of the orbital elements (parameters) that specifies the orientation of an orbit. It is the angle between the orbital plane and a reference plane, the plane of the celestial equator for geocentric orbits and the ecliptic for heliocentric orbits.

### HYPOTENUSE

The side of a plane right triangle opposite the right angle; the longest side of a plane right triangle

### FACE AREA

The total plane area of the portion of a grille, coil, or other items bounded by a line tangent

### INTERSECT

To cut or cross. For example, two non parallel lines in a plane intersect in a point, and a plane intersects a sphere in a circle

### ARGUMENT OF LATITUDE

The angular distance measured in the orbital plane from the ascending node to the orbiting body; the sum of the argument of pericenter and the true anomaly

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