# Euler Angle Results

Orientation of one coordinate system relative to another is defined by a sequence of three successive rotations. The three Euler angles define one such body-fixed rotation sequence.

The three Euler angles, Ψ, Θ, and Φ in Motion Analysis results are the sequence of Z-, X-, and Z-axis rotation angles measured about the body of the rotating coordinate system.
 Psi The first angle of rotation in the Euler angle rotation sequence. Ψ measures the rotation about the Z-axis of the rotating coordinate system. Theta The second angle of rotation in the Euler angle rotation sequence. Θ measures the rotation about the X-axis of the rotating coordinate system after the Ψ rotation has been applied. Phi The third angle of rotation in the Euler angle rotation sequence. Φ measures the rotation about the Z-axis of the rotating coordinate system after the Ψ and Θ rotations have been applied.