Returns the second angle associated with a Body 313 rotation sequence from one coordinate system object to another. This second rotation is referred to as the theta,

, angle, and is used in association with the psi,

, (1st rotation) and phi,

, (3rd rotation) angles.
Positive angular displacement is determined by the right-hand rule.
Format
THETA (Object, Reference Frame)
Arguments
Object | Coordinate system object whose rotation is being measured. |
Reference Frame | Coordinate system object with respect to which the rotation is being measured. |
Example
The following example illustrates the use of the THETA function:
THETA(marker_O, marker_R)See the illustration for
PSI.