Coordinates for Spherical UCS

When a spherical coordinate system is active, you enter coordinates in the order R, T, P, where:

• R is the distance from the point to the origin.

• T() is the angle from the T = 0 axis in a plane defined by the point, the origin, and the T = 0 axis (enter in degrees).

• P() is the angle between the P = 0 axis and the line connecting the point as projected onto the T = 90 plane (enter in degrees).

The following illustration shows a location (A) in spherical coordinates:

Note that the P = 0 axis is the line along which P = 0 and T = 90, and the P = 90 axis is the line along which P = 90 and T = 90.

The following illustration shows you how to determine the direction of the unit vectors for theta and phi using the right hand rule (r,,).